Unrecognized configuration section 'connectionStrings'

Error Message

When starting ArcGIS Manager for the .NET framework, the following error may appear in the browser:

"Server Error in '/ArcGIS/Manager' Application.
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Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Unrecognized configuration section 'connectionStrings'"

Cause

This error is caused by an incorrect ASP.NET version associated with the Web site under which ArcGIS Server is installed.

Solution or Workaround

1. Open IIS manager. To do this, on the ArcGIS Server machine's desktop, click Start > Run. In the Run text box, type INETMGR and press Enter.
   
2. Expand Computer Name > Web Sites > Default Website by clicking the '+' sign.
3. Right-click Default Website and select Properties.
4. Click the ASP.NET tab.
5. Use the drop-down box to change the ASP.NET version from 1.1 to 2.0.5027 (or higher). Click Apply and OK.
6. Test to see if ArcGIS Manager opens. If it does not, restart the ArcGIS Server Object Manager service in the Windows services applet, and test again.