Today I started getting the following error from all of my Sophos clients (Could not find a source for updated packagesModule) After a few minutes the management console would also disconnect. After looking a little closer at the problem, I found out the AV Management server time was off from its DC by roughly 5 minutes. I adjusted the clock on the AV Server and BAM, all of the clients began to update. Have to love Michigan ice storms causing power surges.
Aaron