SSRS – WebForms Error 12019


We have some really long running queries in our SSRS SharePoint integrated mode environment. After a few minutes of processing, we would see the following error:

Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 12019

Interestingly, this issue only occurs when using IE. In Chrome, the report keeps running and works fine.


In our environment, we have an F5 BigIP as the load balancer in front of SharePoint. All we needed to do was set the Idle Timeout to 3600 (default was 300) on the TCP profile for the virtual server.

In other load balancing solutions, there are likely similar settings.


4 thoughts on “SSRS – WebForms Error 12019

  1. David

    We get this error through our Netscaler gateway version 11. I’ve tried IE 11, Chrome and firefox….Frustrating..

    1. John

      HI David

      Did you ever get a solution to this.

      Strangely our users only get the problem with OWA through the netscaler when replying to emails. New emails work fine.

  2. Vimal

    Thanks for posting this solution. Even i had the same issue and on increasing the TCP profile ideal timeout in load balance fixed the issue. I increased it to 1800 seconds and it worked.


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