Pass this on to your folks if they get the following error in a asp.net app on the development server:
“This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms”
Have your developer go into the web config and move the “sessionState” tag to just under the tag and make sure the sessionState is uncommented.
To this point I still only have speculation as to what changed on the server that now is causing this error. Most likely was a setting that changed as part of a security update.