This error just started occuring a couple of days ago on a server that is primarily a web & email server. This machine is not (nor EVER WAS) a member or controller of any domain. It is only on a workgroup and is a single computer on a sonicwall DMZ.
Here are the error details:
Windows cannot determine the associated site for this computer. (The remote procedure call failed and did not execute. ). Group Policy processing aborted.
The error occurs in the application log and repeats every 90 minutes or so... Running GPupdate on a command prompt causes the error to be logged as well.
I haven't associated any performance symptoms with the error (at least not yet).