I have a web application that is in a "web farm" but has the load balancer
configured to stay with the ip address it was initially assigned to. However,
we added machineKey information in our web config file to assure that even if
we did jump servers (which has happened), we would not get this error of
Invalid Viewstate. Is there something else to take into consideration. I have
added the following line to our config files.

<pages validateRequest="false" enableEventValidation="false"
viewStateEncryptionMode ="Never" maxPageStateFieldLength="8192">

<machineKey validationKey="<any key>"

decryptionKey="<any decrypt key>" validation="SHA1" />