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:

HKEY_LOCAL_MACHINE\Software\Microsoft\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 0.0.0.0.
  
  
• 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 0.0.0.0. Setting the Rootver value to 0.0.0.0 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
  
  

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" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).

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