You receive a "This Web Part Page has been modified since you opened it" error message when you click a command on the Modify Shared Page menu after you upgrade your server farm to SharePoint Portal Server 2003 Service Pack 1

You upgrade your medium server farm or large server farm deployment of Microsoft Office SharePoint Portal Server 2003 to SharePoint Portal Server 2003 Service Pack 1 (SP1). After the upgrade operation, you intermittently receive the following error message when you click Modify Shared Page and then click a command on the Modify Shared Page menu: For example, you may experience these symptoms when you connect to the portal site, click Edit Page, click Modify Shared Page, point to Add Web Parts, and then click Browse. If you refresh the Web page, the error message is no longer displayed, and the Web page is displayed as expected.

This problem occurs if the following conditions are true:

• The servers in your server farm are configured to use Windows Network Load Balancing.
• The Affinity setting that is configured for Windows Network Load Balancing is set to None.
• You upgrade the servers in your server farm to SharePoint Portal Server 2003 SP1.

To work around this problem, change the Affinity setting to a setting other than None. For example, set the Affinity setting to Single. To change the Affinity setting for Windows Network Load Balancing, follow these steps:

1. Click Start, point to Control Panel, point to Network Connections, and then click Local Area Connection.
2. Click Properties.
3. Click Network Load Balancing, and then click Properties.
   
   Note Make sure that you click Network Load Balancing, and that you do not click to clear the Network Load Balancing check box.
4. Click the Port Rules tab.
5. In the list of rules, click the rule that you want to configure, and then click Edit.
6. Next to Affinity in the Filtering mode area, click the setting that you want. For example, click Single.
7. Click OK three times, and then click Close.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

The steps in the "Deploying a Medium Server Farm" section and the "Deploying a Large Server Farm" section of the "Deployment Scenarios" chapter of the Microsoft Office SharePoint Portal Server 2003 Administrator's Guide recommend that you set the Affinity setting to None when you set up Windows Network Load Balancing.

For more information about server farm deployments of SharePoint Portal Server 2003, see the "Deployment Scenarios" section of the Microsoft Office SharePoint Portal Server 2003 Administrator's Guide. The Microsoft Office SharePoint Portal Server 2003 Administrator's Guide (Administrator's Help.chm) is located in the Docs folder in the root directory of the SharePoint Portal Server 2003 CD. For additional information about how to configure Network Load Balancing parameters in Microsoft Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base: