Known Issues with KB3148812
UPDATE: A newer post regarding KB3148812 is published at https://blogs.technet.com/b/wsus/archive/2016/04/22/what-you-need-to-know-about-kb3148812-part-two.aspx.
Hi WSUS admins, just a quick post to let you know that we've received word of some issues happening (e.g., WSUS admin console is inaccessible, clients can't contact WSUS) in the wild after installing KB3148812. It is critical functionality; however, you don't lose anything by skipping installation until we publish media that leverages this scenario, which will not be happening this month. For now, feel free to remove the patch if it's causing you problems, and we'll get to the bottom of the issues that have been reported. If you'd like to assist in resolving this, then please Email Blog Author and we'll follow up with you.
We appreciate your patience while we get this sorted.