Specifies whether this computer will receive security updates and other important downloads through the Windows automatic updating service.
Some organizations have a test fix from Microsoft, called the "test package." KB3159706 will update it.
Microsoft's announcement recommended these steps for organizations with WSUS systems affected by the bad KB3148812 patch: In other WSUS news, Microsoft's WSUS service went down for about 12 hours on May 4. Yesterday, organizations couldn't get updates to WSUS.
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As always before performing anything; check, double check, test and always ensure you have a backup.