The Protected Object Server File Synsoacc.dll — An Error Has Been Signaled By

klist purge Reboot and attempt to re-authenticate.

w32tm /resync net time \\yourdomaincontroller /set Then verify the Kerberos ticket cache: klist purge Reboot and attempt to re-authenticate

Run the following from an admin command prompt: klist purge Reboot and attempt to re-authenticate