ASP.NET Rootver is damaged

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at]  

Topic Last Modified: 2007-01-08

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine the value set on the Rootver key for ASP.NET:


The Exchange Server Analyzer displays an error if the following conditions exist:

  • The Exchange Server Analyzer finds that the Rootver value is set to

  • The Cluster service is running.

Sometimes ASP.NET Setup fails without providing a notification of the failure. In these cases, the Rootver key is set to Setting the Rootver value to causes the Microsoft Exchange System Attendant service or other Exchange Server services to fail to start on Exchange Server 2003 and Exchange Server 2007 clusters. You must correct this error by setting the Rootver value to one of the following:

  • Exchange Server 2003 Rootver key = 1.1.4322.0.

  • Exchange Server 2007 Rootver key = 2.0.50727.0


This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

To set Rootver to 1.1.4322.0

  1. Open a registry editor, such as Regedit.exe or Regedt32.exe.

  2. Navigate to: HKLM\Software\Microsoft\ASP.NET\

  3. In the details pane, double-click the RootVer key.

  4. In the Edit String dialog box, set the Value data to the appropriate value from the article above, and then click OK.

  5. Exit the registry editor.

Before you edit the registry, and for information about how to edit the registry, see the Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows registry" (