Earlier this week, Microsoft pushed out KB3148812, which enables ESD decryption provisioning in WSUS (on Windows Server 2012 and Windows Server 2012 R2).  From what I read and understand, KB3148812 is going to be a mandatory update for WSUS to support Windows 10 updates after May 1.  Unfortunately, it appears that KB3148812 also breaks the WSUS console.  Rather than re-issue KB3148812 so it doesn’t break WSUS, Microsoft has published in a blog posting the necessary post-install steps to “un-break” WSUS after install KB3148812.

Basically you need to perform two steps to return WSUS to a working condition on Windows 2012.  First, you need to re-run the WSUS post-install.  And then you also need to add HTTP Activation to your WSUS server.

For Step 1, to re-run post-install, open an administrative command prompt and run:

"C:\Program Files\Update Services\Tools\Wsusutil.exe" postinstall /servicing

For Step 2, to install HTTP Activation, open an administrative PowerShell command prompt and run:

Install-WindowsFeature -Name NET-WCF-HTTP-Activation45

No reboot should be necessary and the WSUS console should now open and function normally for you.  There is the possibility you’ll still get client connectivity issue though with an error of 0x80244007, which is something entirely different that Microsoft is still looking at as of 2016.04.22.