Windows Update error 800B0001
If you installed the Windows update engine update to your workstations, you’ll find that they can no longer communicate with WSUS.
If you update the WU agent on the workstations, they now have the hardening stuff and can no longer “talk” to WSUS. You now have to install the update for WSUS 2720211.
This sucker is an all or nothing. You can’t just update the clients without needing the server up’d as well.
Set up WSUS. To do this, at a command prompt, type one of the following commands, as applicable to your system:
WSUS-KB2720211-x64.exe /q C:\MySetup.log
REBOOT wsus server after