On my Windows 8.1 machines, the so-called "April Update" from KB2919355 was installed automatically by Windows Update, as expected. However, on my 2012 R2 server, the update was not automatically installed, and Windows Update says "no updates are available".
I know that I can download and apply KB2919355 from the Microsoft Downloads center, but missing this update makes me worried that this machine may be missing other updates as well. The server is updating directly from Microsoft, not from WSUS, and there is nothing else that I know of which could be blocking the update. The machine does have the prerequisite update from KB2919442.
How can I find out why this update is missing? What can I do to make sure this doesn't continue to be an issue with other updates?
(I wish I had access to another 2012 R2 server to confirm whether this is an issue specific to this machine or not, but my other Windows servers are running 2008 R2 or 2012 original, so this update doesn't apply to them.)