asp.net - machine key not working - viewstate mac failed -


i keep getting viewstate validation error:

system.web.httpexception (0x80004005): validation of viewstate mac failed. if application hosted web farm or cluster, ensure configuration specifies same validationkey , validation algorithm. autogenerate cannot used in cluster. ---> system.web.ui.viewstateexception: invalid viewstate...

i have arr load balancing site , think when switches user 1 server (even though have affinity selected) throws this. - have machine key configured , have same encryption method, decryption method, validation key , decryption key configured on both of 2 servers in farm. missing something?

one of our servers behind on windows updates , after running updates problem appears gone. i've re-run exact tests consistently invoked exception before , it's not having issues.


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