How to Verify Client Computer Configuration
This topic helps you troubleshoot an unsuccessful RPC over HTTP connection by giving a checklist to verify RPC over HTTP configuration on a Windows XP client computer.
Procedure
Client Computer Configuration Checklist
Make sure that the client computer is running Microsoft® Office Outlook 2003. To verify your version of Outlook, start Outlook, and then click About Microsoft Outlook on the Help menu. For detailed steps, see a video that shows you how to verify that Outlook 2003 is running on a Windows XP client. The video is in Windows Media Player format. If you have trouble viewing the video, see the Windows Media Player support page.
Make sure that the client computer is running Microsoft Windows® XP together with the latest service pack. The latest service pack for Windows XP at the time of this writing is Windows XP Service Pack 1 (SP1). For detailed steps, see a video that shows you how to verify that the Windows XP client is running Service Pack 1 or later. The video is in Windows Media Player format. If you have trouble viewing the video, see the Windows Media Player support page.
Make sure that the client computer has the update from Microsoft Knowledge Base article 331320 installed if you are running Windows XP SP1. For more information, see Microsoft Knowledge Base article 331320, Outlook 2003 performs slowly or stops responding when connected to Exchange Server 2003 through HTTP.
This fix updates the Rpcrt4.dll file in Windows XP. You must be running Rpcrt4.dll version 5.1.2600.1142 or later. For detailed steps, see a video that shows you how to verify that Windows XP Service Pack 1 has hotfix 331320 installed. The video is in Windows Media Player format. If you have trouble viewing the video, see the Windows Media Player support page.
Verify that the Outlook 2003 client profile is configured properly to use RPC over HTTP. For detailed steps, see How to Create an Outlook Profile for Users to Use with RPC over HTTP.
Check the RPC over HTTP connection status on an Outlook 2003 client. For detailed steps, see How to Check RPC over HTTP Connection Status on Outlook 2003 Client.
Make sure that on the client computer, you are able to connect to Exchange Server 2003 by specifying login credentials in user principal name (UPN) format. If unable to connect using the UPN format, the client computer should install the hotfix that is described in the following Microsoft Knowledge Base article, 830355: You cannot use Outlook 2003 over the Internet by using your user principal name (UPN).
Verify that when configuring an Outlook 2003 client profile using the Email Accounts wizard, the Exchange over the Internet area appears on the Connection tab of the Microsoft Exchange Server dialog box. For detailed steps on enabling the Exchange over the Internet area in Outlook 2003 Email Accounts wizard, see How to Enable 'Exchange over the Internet' in Outlook 2003 E-mail Accounts Wizard.
Verify that the RPC Proxy Server Extension is loading correctly. If Outlook clients experience connection problems after you configure all the required settings for RPC over HTTP on the server side, it may be because the RPC Proxy Server Extension is not loading correctly. For information on verifying that RPC Proxy Server Extension is loading correctly, see How to Verify That RPC Proxy Server Extension Is Loading Properly.
For More Information
For information about deploying RPC over HTTP in different Exchange Server 2003 scenarios, see Deployment Scenarios for RPC over HTTP
For more information about troubleshooting RPC over HTTP communications, see the following topics:
How to Verify That World Wide Web Publishing Service Is Running
How to Verify That SSL Certificate Is Installed on RPC Proxy Server
How to Verify That RPC Proxy Server Has Basic Authentication Configured
How to Verify That RPC Proxy Server Extension Is Loading Properly
Microsoft Knowledge Base Article 826486, You cannot use RPC over HTTP with a proxy automatic configuration script