Charles Anderson

On WS2012R2 I only had to uninstall KB2938066 from Programs and Features and reboot. No changes made client-side. Clients remained at Core/Aux of 7.6.7600.320, but started working again. In troubleshooting clients I tried wiping out WUagent entirely and re-registering DLLs as per http://support.microsoft.com/kb/971058 but it made no difference. Strongly hints at the root cause being server-side.

My environment is experiencing the same issue since installing KB2938066 on the WSUS server. Only clients with the new agent are broken: Setup Client version: Core: 7.6.7600.320 Aux: 7.6.7600.320 The ones like this are functional: Setup Client version: Core: 7.6.7600.320 Aux: 7.6.7600.256 We also use SSL on 8531 with an enterprise certificate whose issuer is pushed out by GPO. Failures begin with FATAL: Error: 0xc000000d when verifying trust for C:\Windows\SoftwareDistribution\SelfUpdate\TMPD28D.tmp which seems to directly stem from these lines after the WuAuServ service starts but before the Agent initializes: DtaStor Default service for AU is {00000000-0000-0000-0000-000000000000} DtaStor Default service for AU is {9482F4B4-E343-43B6-B170-9A65BC822C77} Agent WARNING: could not get the auth file name 0x80070002 Agent WARNING: Default Service Recovery: Attempting to add pending registration for service 7971f918-a847-4430-9279-4a52d1efe18d to the data store Uninstalling KB2938066 from the WSUS server and rebooting was an instant fix for both client versions.