The security validation for this page has timed out" error message when a user submits data to Windows SharePoint Services

                                       

Cause: This behavior occurs if a user submits information to the server after the security validation time-out that is set for the virtual server expires. By default, the security validation time-out value in Windows SharePoint Services is set to 30 minutes. That is, if 30 minutes pass before the user clicks Save and Close to submit data to the server, the user must reenter the data and then resubmit that data to the server.

      Workaround: Increase the security validation time-out value. To do this, follow these steps:

·        Click Start, point to All Programs, point to Administrative Tools, and then click SharePoint Central Administration.

·        Under Virtual Server Configuration on the Windows SharePoint Services Central Administration page, click Configure virtual server settings.

·        On the Virtual Server List page, click the name of the virtual server that you want to configure.

·        Under Virtual Server Management on the Virtual Server Settings page, click Virtual server general settings.

·        In the Web Page Security Validation area of the Virtual Server General Settings page, specify the number of minutes that you want to set for the security validation time-out, and then click OK.