Tài liệu Module 2: Configuring Web and FTP Sites doc

Module 2: Configuring Web and FTP Sites Contents Overview Configuring Properties Creating Additional Sites 11 Creating Virtual Directories 13 Redirecting Requests 14 Creating Custom Error Messages 16 Lab A: Creating and Configuring Additional Web and FTP Sites 18 Review 30 Information in this document is subject to change without notice The names of companies, products, people, characters, and/or data mentioned herein are fictitious and are in no way intended to represent any real individual, company, product, or event, unless otherwise noted Complying with all applicable copyright laws is the responsibility of the user No part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of Microsoft Corporation If, however, your only means of access is electronic, permission to print one copy is hereby granted Microsoft may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document Except as expressly provided in any written license agreement from Microsoft, the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property  2001 Microsoft Corporation All rights reserved Microsoft, Active Directory, ActiveX, BackOffice, FrontPage, MS-DOS, Outlook, PowerPoint, SQL Server, Visual Basic, Visual InterDev, Visual SourceSafe, Visual Studio, Windows, Win32, Windows Media, and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the U.S.A and/or other countries Other product and company names mentioned herein may be the trademarks of their respective owners Module 2: Configuring Web and FTP Sites Instructor Notes Presentation: 30 Minutes Lab: 45 Minutes This module provides students with the knowledge and skills to create and configure Microsoft® Internet Information Services (IIS) 5.0 Web and File Transfer Protocol (FTP) sites The module consists of lecture, class discussion, and hands-on labs After completing this module, students will be able to: Configure and modify the master properties Create and configure additional Web and FTP sites Create virtual directories Redirect requests to another directory or program Create custom error messages Materials and Preparation This section provides the materials and preparation tasks that you need to teach this module Required Materials To teach this module, you need the Microsoft PowerPoint® file 2295A_02.ppt Preparation Tasks To prepare for this module, you should: Read all of the materials for this module Complete the lab iii iv Module 2: Configuring Web and FTP Sites Instructor Setup for a Lab This section provides setup instructions that are required to prepare the instructor computer or classroom configuration for a lab Lab A: Creating and Configuring Additional Web and FTP Sites To prepare for the lab Read the module Complete the labs from Module Module Strategy Use the following strategy to present this module: Configuring Properties Explain how to configure and manage properties in general Specific properties that require extensive explanation, such as security properties, are covered in other modules Explain the relationship between master properties and object properties, particularly how inheritance can be used to manage properties Creating Additional Sites Discuss the methods for hosting multiple sites on a single server Mention that the host header method cannot be used for FTP sites Creating Virtual Directories Explain how virtual directories can be used to create an extensive Web site without requiring that all content be stored on the Web server Redirecting Requests Explain when it is useful to redirect requests Demonstrate the procedure Creating Custom Error Messages Discuss the purpose of error messages Show the location of the IIS error messages and demonstrate how to edit them Module 2: Configuring Web and FTP Sites Customization Information This section identifies the lab setup requirements for a module and the configuration changes that occur on student computers during the labs This information is provided to assist you in replicating or customizing Microsoft Official Curriculum (MOC) courseware Important The lab in this module is also dependent on the classroom configuration that is specified in the Customization Information section at the end of the “Classroom Setup Guide” for Course 2295A, Implementing and Supporting Microsoft Internet Information Services 5.0 Lab Setup The following list describes the setup requirements for the lab in this module Setup Requirement The lab in this module requires the FTP service To prepare student computers to meet this requirement, perform one of the following actions: • Complete Module 1, “Installing Internet Information Services 5.0,” in Course 2295A, Implementing and Supporting Microsoft Internet Information Services 5.0 – Or – To install FTP Open Control Panel Double-click Add/Remove Programs Click Add/Remove Windows Components Click Internet Information Services (IIS), and then click Details In the Internet Information Services (IIS) dialog box, select the File Transfer Protocol (FTP) Server check box, and then click OK Click Next, follow the on-screen instructions, and then click Finish v Module 2: Configuring Web and FTP Sites Overview Topic Objective To provide an overview of the module topics and objectives Lead-in In this module, you will learn how to create and configure Web and FTP sites Configuring Properties Creating Additional Sites Creating Virtual Directories Redirecting Requests Creating Custom Error Messages *****************************ILLEGAL FOR NON-TRAINER USE****************************** Each Web server contains a set of master properties that are applied to each Web site created on that Web server You can change the master properties so that your desired settings are used automatically whenever you create a Web site You can create additional Web sites and virtual directories to form an efficient Web structure for your business needs To provide a more useful experience for clients who connect to your Web site, redirect requests as necessary and customize the error messages After completing this module, you will be able to: Configure and modify the master properties Create and configure additional Web and File Transfer Protocol (FTP) sites Create virtual directories Redirect requests to another directory or program Create custom error messages Module 2: Configuring Web and FTP Sites Configuring Properties Topic Objective To provide an overview of how properties work in IIS Lead-in You can change the default properties for a Web site Changing Master Properties Using Property Inheritance Modifying Properties for IIS Objects Configuring an FTP Site Assigning Web Site Operators *****************************ILLEGAL FOR NON-TRAINER USE****************************** When you install Microsoft® Internet Information Services (IIS) 5.0, default values are assigned to the properties for the Web server, the Web and FTP sites, and all the folders and files within those sites You can use these default settings, or you can change them to suit your Web publishing needs You may be able to provide better performance and improved security by making adjustments to the default settings You can set master properties that are inherited by all sites, or you can set properties on an object such as an individual site, folder, or file Properties set on an object override the master properties Explain to students that specific properties, such as security settings and performance settings, are explained in other modules Note This module explains some general configuration properties For more detailed information about setting properties, see the following modules in Course 2295A, Implementing and Supporting Microsoft Internet Information Services 5.0 For more information on See Setting security properties Module 5, “Implementing Security on a Web Server” Setting performance and logging properties Module 6, “Monitoring and Optimizing a Web Server” Setting FrontPage Server Extension properties Module 8, “Managing FrontPageExtended Webs” Module 2: Configuring Web and FTP Sites Changing Master Properties Topic Objective To explain the purpose of master properties and how to change them Lead-in When you install IIS, your Web server is configured with default master properties Master Properties WWW Service Default Web Site Htmldocs Default.htm FTP Service Default FTP Site Graphics Layout.css *****************************ILLEGAL FOR NON-TRAINER USE****************************** When you install IIS, your Web server is configured with default master properties Master properties apply to the Web and FTP sites on that server, and to the folders and files within those sites When configuring your Web site, you can modify the master properties so that all the Web and FTP sites that you create inherit the appropriate settings There are two sets of master properties: WWW service master properties, which apply to Web sites, and FTP service master properties, which apply to FTP sites The FTP service master properties are only available if you have installed the FTP service To change the master properties: Delivery Tip Demonstrate how to open the WWW service and FTP service master properties Click Start, point to Programs, point to Administrative Tools, and then click Internet Services Manager In Administrative Tools, the IIS console is called Internet Services Manager However, when you open the console, it is called Internet Information Services, also known as the IIS snap-in In the IIS snap-in, right-click the Web server, and then click Properties Under Master Properties, select WWW Service or FTP Service Click Edit Click Apply after you change a property Click OK when you are finished Note If you want information on a specific property or value, click Help on the property sheet Module 2: Configuring Web and FTP Sites Using Property Inheritance Topic Objective To explain how properties are inherited by IIS objects Lead-in Master properties are inherited by sites, directories, and files Properties on Higher Levels Inherited by Lower Levels A Property Change at Site, Directory, or File Level Overrides the Master Property For that level For any lower levels that you select List Values are Treated as a Single Property *****************************ILLEGAL FOR NON-TRAINER USE****************************** Master properties are inherited by all the sites that you create, and by the directories and files within those sites You can change properties at the site and directory levels for FTP sites, and also at the file level for Web sites Settings on lower levels inherit the values from higher levels For example, a file inherits properties set at the directory level Properties that you change at the site, directory, or file level override the master property When you change a property for an individual site, directory, or file, you can select which lower level objects should inherit the new property value Some properties have a value that takes the form of a list For example, the value of the default document can be a list of documents IIS treats the entire list as a single property When you change a list property and select to apply the change to lower level objects, the entire list for the lower level object is replaced by the new list; lists are not merged 18 Module 2: Configuring Web and FTP Sites Lab A: Creating and Configuring Additional Web and FTP Sites Topic Objective To introduce the lab Lead-in In this lab, you will add a Web site operator to your Web site, change the master properties, and then create and configure new sites and virtual directories *****************************ILLEGAL FOR NON-TRAINER USE****************************** Objectives After completing this lab, you will be able to: Add a Web site operator Change the master properties Create and configure new Web sites Create local and remote virtual directories Install and configure a new FTP site Prerequisites Before working on this lab, you must have: Knowledge of IP addressing and DNS name resolution Experience logging on and off Microsoft Windows® 2000 Estimated time to complete this lab: 45 minutes Module 2: Configuring Web and FTP Sites 19 Exercise Adding a Web Site Operator In this exercise, you will add a Web site operator to your Web server After adding the Web site operator, you will test the Web site operator account to examine the extent of the privileges allowed Scenario You have decided that you want another person to be able to administer your Web site, but you want that person’s administrative privileges limited to only one Web site To accomplish this, you add that person as a Web site operator for your Web server Tasks Log on as iisadmin with a password of password, open the IIS snap-in, and then expand the Web server to view its contents Detailed steps a Log on as iisadmin with a password of password b Click Start, point to Programs, point to Administrative Tools, and then click Internet Services Manager In Administrative Tools, the IIS console is called Internet Services Manager However, when you open the console, it is called Internet Information Services, also known as the IIS snap-in c In the IIS snap-in, attempt to expand server_name (where server_name is the name of your server) d Right-click server_name, and then look for Properties Were you able to expand server_name? No Viewing the Web and FTP sites is a privilege reserved for administrators and IIS Web site operators only Are you able to view the properties of your IIS server? No Viewing the properties of the IIS server is a privilege reserved for administrators (continued) e Close the IIS snap-in 20 Module 2: Configuring Web and FTP Sites Tasks Detailed steps a Click Start, point to Programs, point to Administrative Tools, rightclick Internet Services Manager, and then click Run As b In the Run As Other User dialog box, verify that Administrator appears as the user name, type password for the password, and then click OK Open the Master Properties dialog box to edit WWW service master properties a In the IIS snap-in, in the console tree, right-click server_name, and then click Properties b Under Master Properties, click Edit Add iisadmin as an operator a In the WWW Service Master Properties for server_name dialog box, on the Operators tab, click Add In the Select Users or Groups dialog box, select iisadmin, click Add, and then click OK c Open the IIS snap-in as Administrator with a password of password b Click OK twice, and then close the IIS snap-in Note: You must close the IIS snap-in because you were running it as an Administrator You then reopen the IIS snap-in so that you are running it as the iisadmin operator Open the IIS snap-in and expand the Web server to view its contents a Open the IIS snap-in, and then attempt to expand server_name Where you able to expand server_name? Yes Web site operators are allowed to expand server_name to view the corresponding Web and FTP sites Attempt to open the properties for server_name a Right-click server_name, and then, on the menu, look for Properties Are you able to view the properties of your IIS server? No Viewing the properties of the IIS server is restricted to administrators only Close all windows and log off a Close all windows and log off Module 2: Configuring Web and FTP Sites 21 Exercise Changing the Master Properties In this exercise, you will change the master properties and determine the effect on existing Web sites Scenario Your Web server hosts several Web sites You want to change the connection timeout setting for all of the Web sites You could change the property for each Web site, but making these changes would take a long time Instead, you decide to change the master properties, which affect all of the Web sites on the server Tasks Detailed steps Log on as Administrator with a password of password and record the connection timeout setting that appears on the Web Site tab of the default Web site property sheet a Log on as Administrator with a password of password b Open the IIS snap in, and in the console tree, expand server_name c Right-click Default Web Site, and then click Properties d On the Web Site tab, find the Connection Timeout setting and record its value here: seconds e Click Cancel Change the connection timeout setting to 1,000 seconds in the WWW Service Master Properties dialog box a In the IIS snap-in, in the console tree, right-click server_name, and then click Properties b On the Internet Information Services tab, under Master Properties, click Edit c In the WWW Service Master Properties for server_name dialog box, on the Web Site tab, change the Connection Timeout to 1000 d Click OK twice a Right-click Default Web Site, and then click Properties b On the Web Site tab, find Connection Timeout and record its value here: seconds c Click Cancel View the connection timeout setting for the default Web site 22 Module 2: Configuring Web and FTP Sites Exercise Creating New Web Sites In this exercise, you will create two new Web sites You will also override the connection time out setting from the master properties for one of the new Web sites Scenario Your organization has grown and, as a result, you need to add more Web sites In addition, you have analyzed traffic to existing Web sites, and want to change the connection timeout setting, which is a global property You will use the master properties to make this change Tasks a In the IIS snap-in, in the console tree, right-click server_name, point to New, and then click Web Site b In the Web Site Creation Wizard, click Next c On the Web Site Description page, in the Description box, type server_nameA (where server_name is the name of your server), and then click Next d On the IP Address and Port Settings page, in the IP Address list, click 192.168.y.z (where y is your subnet ID and z is your host ID), and then click Next e On the Web Site Home Directory page, in the Path box, type C:\MOC\2295A\Labs\Mod2\A and then click Next f On the Web Site Access Permissions page, click Next, and then click Finish g Repeat steps a through f to create a second Web site Use server_nameB for the name and use C:\MOC\2295A\Labs\Mod2\B for the home directory Note the connection timeout setting on the Web site tab Change the connection timeout setting in server_nameA to 999 a Open the property sheet for server_nameA, change the Connection Timeout setting to 999, and then click OK b Open the property sheet for server_nameB, verify that Connection Timeout is set to 1000, and then click Cancel Open the WWW Service Master Properties dialog box for server_name and set the connection timeout setting to 1111 without overriding the connection timeout setting for server_nameA a Open the WWW Service Master Properties for server_name dialog box, in the Connection Timeout box, change the setting to 1111, and then click OK three times Note the connection timeout setting for the server_nameA and server_nameB Web sites a Open the property sheet for server_nameA, verify that the Connection Timeout setting is set to 999, and then click Cancel b Open the property sheet for server_nameB, verify that the Connection Timeout setting is set to 1111, and then click Cancel Create two virtual Web sites named server_nameA and server_nameB Use the IP address of 192.168.1.x for both Web sites (where 192.168.1.x is your computer’s IP address.) Server_nameA should use C:\MOC\2295A\Labs\Mod 2\A for its home directory and server_nameB should use C:\MOC\2295A\Labs\Mod 2\B for its home directory Detailed steps Module 2: Configuring Web and FTP Sites 23 Exercise Configuring Web Sites with Host Headers In this exercise, you will configure the new Web sites to work with host headers Host headers allow multiple Web sites to be supported on one Web server When the URL is passed to the Web server, the Web server takes the HTTP header information and uses host headers to map the URL to the correct Web site Scenario You have added new Web sites for your organization For all of your Web sites to be supported on one server, you must also: Update the DNS server that is authoritative for your Web site with the A records that contain the fully qualified domain names (FQDNs) and IP address of your Web sites Configure the host headers on your server The DNS server on the instructor’s computer has already been populated with the correct records that map to your IP address All that you need to is create the host headers Tasks Connect to http://servernameA/default htm by using Internet Explorer Detailed steps a Start Internet Explorer b On the Welcome to the Internet Connection Wizard page, click I want to set up my Internet connection manually or I want to connect through a local area network (LAN), and then click Next c On the Setting up your Internet connection page, click I connect through a local area network (LAN), and then click Next d On the Local area network Internet configuration page, click Next e On the Set Up Your Internet Mail Account page, click No, click Next, and then click Finish f In the Address box, type: http://server_nameA/default.htm and then press ENTER g Start a second copy of Internet Explorer h In the Address box, type http://server_nameB/default.htm and then press ENTER The Web page for server_nameA appears The Web page for server_nameB does not appear i Close both copies of Internet Explorer 24 Module 2: Configuring Web and FTP Sites Tasks a Open the property sheet for server_nameA, and then on the Web Site tab, click Advanced b In the Advanced Multiple Web Site Configuration dialog box, click 192.168.y.z (where y is your subnet ID and z is your host ID), and then click Edit c In the Host Header Name box, type server_nameA and then click OK d Click OK twice e Add a host header name to server_nameA and to server_nameB Detailed steps Repeat steps a through d to add a host header name for the server_nameB Web site Start the server_nameB Web site a In the IIS snap-in, right-click server_nameB, and then click Start Start Internet Explorer, and then connect to http://server_nameA/default htm and http://server_nameB/default htm to test the Web sites a Start Internet Explorer b In the Address box, type http://server_nameA/default.htm and then press ENTER c In the Address box, type http://server_nameB/default.htm and then press ENTER d Close Internet Explorer Module 2: Configuring Web and FTP Sites 25 Exercise Creating a Local Virtual Directory In this exercise, you will create a local virtual directory on your new Web site Local virtual directories give you the ability to use directories on your computer other than the root directory Scenario As your Web site grows, you find it cumbersome to manage all of the content in the root directory To make it easier to add and organize content, you decide to create and use local virtual directories Local virtual directories enable you to place content in other directories and partitions on your hard disk Tasks Test the virtual directory by using the following URL: http://server_nameA/LVDir In the IIS snap-in, right-click server_nameA, point to New, and then click Virtual Directory b On the Welcome to the Virtual Directory Creation Wizard page, click Next c On the Virtual Directory Alias page, in the Alias box, type LVDir and then click Next On the Web Site Content Directory page, in the Directory box, type or browse to C:\MOC\2295A\Labs\Mod2\Vdir and then click Next e a d On server_nameA, create a virtual directory called LVdir that maps to C:\MOC\2295A\Labs\Mod2 \Vdir Detailed steps On the Access Permissions page, click Next, and then click Finish a Start Internet Explorer b In the Address box, type http://server_nameA/LVDir and then press ENTER c Close Internet Explorer 26 Module 2: Configuring Web and FTP Sites Exercise Creating a Remote Virtual Directory In this exercise, you will create a remote virtual directory Remote virtual directories enable you to place content on other servers on your network Scenario You have published so much content on your Web site that you have run out of disk space In addition, you cannot add more disk space to your Web server Therefore, you will create a remote virtual directory, which will allow you to place new content on other servers on your network Tasks a In the IIS snap-in, right-click server_nameB, click New, and then click Virtual Directory b On the Welcome to the Virtual Directory Creation Wizard page, click Next c On the Virtual Directory Alias page, in the Alias box, type RVDir and then click Next d On the Web Site Content Directory page, in the Directory box, type \\London\Remotedir\Virtual and then click Next e On the User Name and Password page, in the User name box, type Administrator f In the Password box, type password and then click Next g On server_nameB, create a virtual directory called RVdir that maps to \\London\Remotedir\Virtual and use the user name of Administrator with a password of password Detailed steps When the Confirm Password message box appears prompting you to re-enter your password, type password and then click OK Warning: The administrator account was used for classroom purposes only In practice, you would never use the administrator account for virtual directory access for security reasons (continued) Test the virtual directory by using the following URL: http://server_nameB/RVdir h On the Access Permissions page, click Next, and then click Finish a Start Internet Explorer b In the Address box, type http://server_nameB/RVDir and then press ENTER c Close Internet Explorer Module 2: Configuring Web and FTP Sites 27 Exercise Creating and Configuring a New FTP Site In this exercise, you will create and configure a new FTP site Scenario Your organization has an FTP site that allows customers to download white papers, drivers, and other software tools A select group of your customers would like to use beta software However, you would like to keep the general public from gaining access to the beta software To meet this goal, you decide to create a second FTP site with a port number of 9100 Only the select group of customers is given the port number so that they can gain access to the site Tasks b On the Welcome to the FTP Site Creation Wizard page, click Next c On the FTP Site Description page, in the Description box, type FTP Site and then click Next On the IP Address and Port Settings page, in the IP Address list, click 192.168.y.z (where y is your subnet ID and z is your host ID) In the TCP port box, type 9100 and then click Next f On the FTP Site Home Directory page, in the Path box, type C:\MOC\2295A\Labs\Mod2\Ftp2 and then click Next g Configure the maximum number of connections to 1, and create welcome, exit and maximum connection FTP site messages In the IIS snap-in, in the console tree, right-click server_name, point to New, and then click FTP Site e a d Create a second FTP site using port 9100 and set the home directory as C:\MOC\2295A\Labs\Mod2 \FTP2 Detailed steps On the FTP Site Access Permissions page, click Next, and then click Finish a In the IIS snap-in, right-click FTP Site 2, and then click Properties b On the FTP Site tab, under Connection, change the Limited To value to c On the Messages tab, type a welcome message, an exit message, and a maximum connections message in the corresponding boxes, and then click OK 28 Module 2: Configuring Web and FTP Sites Exercise Testing FTP Sites In this exercise, you will test the new FTP site to verify the connection and test the connection limit settings Scenario When configuring new Web and FTP sites, one of the best practices to follow is to test the site before connecting it to the Internet Everything should be tested: security, connection limits, outgoing messages, and so on Tasks Start Internet Explorer, connect to FTP Site Start a second copy of Internet Explorer and attempt to create a second connection to FTP Site Detailed steps a Start Internet Explorer b In the Address box, type FTP://server_name:9100 and then press ENTER Did you receive a welcome message? Yes Internet Explorer 5.0 displays the welcome message on the left side (continued) c Start a second copy of Internet Explorer d In the Address box, type FTP://server_name:9100 Were you able to connect to this FTP site a second time? What message did you receive? No A second connection could not be made The message informed me that my login was not accepted and prompted me to log in (continued) e In the Login As dialog box, click Cancel, and then close all instances of Internet Explorer Module 2: Configuring Web and FTP Sites Tasks Use the command mode FTP client to connect to FTP Site Detailed steps a Open a command prompt b At the command line, type FTP and then press ENTER c Type Open server_name 9100 and then press ENTER d When prompted for a user name, type anonymous and then press ENTER e When prompted for a password, press ENTER f 29 At the FTP command prompt, type bye and then press ENTER Did a welcome message and an exit message appear? Why or why not? Yes Both messages appeared because they are designed to work with command mode FTP Test the maximum connections setting a Start Internet Explorer b In the Address box, type FTP://server_name:9100 and then press ENTER c Switch to the command prompt, and then at the command line, type FTP and then press ENTER d Type Open server_name 9100 and then press ENTER e At the FTP command prompt, type bye and then press ENTER Note: Instead of being prompted for a username, you are warned that the FTP server has reached the maximum number of connections and the remote host has closed the connection Close all windows and log off a Close all windows and log off 30 Module 2: Configuring Web and FTP Sites Review Topic Objective To reinforce module objectives by reviewing key points Lead-in The review questions cover some of the key concepts taught in the module Configuring Properties Creating Additional Sites Creating Virtual Directories Redirecting Requests Creating Custom Error Messages *****************************ILLEGAL FOR NON-TRAINER USE****************************** You set Index.htm as the default document in the WWW service master properties You then set Default.htm as the default document for the default Web site Next, you create a virtual directory in your default Web site What will be the default document setting for the virtual directory? If you create a new Web site, what will be its default document setting? The virtual directory will inherit the default document of the default Web site, Default.htm A new Web site will inherit the default document in the master properties, Index.htm You create a Web site for your company, Northwind Traders, which is connected to the Internet Several months later, your company merges with another company, Contoso, Ltd The new company will also be called Contoso, Ltd., and you now must redirect all inquiries to the Northwind Traders Web site (nwtraders.msft) to the Contoso, Ltd Web site (contoso.msft) How you configure this redirection? Open the property sheet for nwtraders.msft On the Home Directory tab, select A redirection to a URL In the Redirect to box, type http://contoso.msft Module 2: Configuring Web and FTP Sites You want to be notified when users on your intranet get an HTTP 401 (unauthorized) error message How can you request that they e-mail you when they get this message? Create an htm page with the information that you want users to see when they get the HTTP 401 error message In the properties for your Web site, map each HTTP 401 error to this htm page 31 THIS PAGE INTENTIONALLY LEFT BLANK ... your Web sites easier to manage and provides extra security for them 6 Module 2: Configuring Web and FTP Sites To change the home directory: In the IIS snap-in, right-click the Web or FTP site... timeout setting for the default Web site 22 Module 2: Configuring Web and FTP Sites Exercise Creating New Web Sites In this exercise, you will create two new Web sites You will also override the... corresponding boxes, and then click OK 28 Module 2: Configuring Web and FTP Sites Exercise Testing FTP Sites In this exercise, you will test the new FTP site to verify the connection and test the connection