Invalid viewstate error

Question

I\'m getting an invalid viewstate error with regard to the ScriptResource.axd. Just wondering if anyone of you could help me on this. Error is:

2009-02-24 09:46:30,02         


        

Answer 1

This can happen if the machineKey of the app pool that receives the request for scriptresource.axd is different from that of the app pool that served the original page. This is most likely if you're using a web farm. It can also happen on a single server if the app pool restarts, as a new machine key will be generated. The solution to either is to put an fixed machineKey in your web.config.