Monday, July 23, 2012

Sys.Webforms.PageRequestManagerServerErrorException ...:500

Ajax Error: Sys.Webforms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was : 500

This issue sometimes occurs when you have a control registered as an AsyncPostbackTrigger in multiple update panels.

Resolution: To solve this issue we need to add below web.config entry to WFS the servers.

<add key="aspnet:MaxHttpCollectionKeys" value="100000" />

<system.web.extensions> <scripting> <scriptResourceHandler enableCompression="false" enableCaching="true"/> </scripting> </system.web.extensions>


  1. thank you a lot problem is solved by this solution

    many thanks

  2. Thanks alot for this solution because you just save my job