A fix is now available from Microsoft that resolves the issue where some computers that have the KB 2919355 update for Windows 8.1 and Windows Server 2012 R2 installed stop scanning against Windows Server Update Services 3.0 Service Pack 2 (WSUS 3.0 SP2 or WSUS 3.2)-based servers that are configured to use HTTPS and do not have TLS 1.2 enabled. Direct download links, installation instructions, and more information you can use to check if you’re impacted by this issue, are provided on the KB 2959977 page.
If you manually imported KB 2919355 prior to the issue of KB 2959977, you should decline the old revision on your WSUS server. Once you decline the revision in WSUS, it will no longer be distributed to clients.
For all users (even if your environment was not impacted), we recommend that administrators approve the latest revision of KB 2919355 for distribution to enable deployment of Windows 8.1 Update in your environment.