We have 3 updates this month that have been replicated to all the distribution servers. From there, so far, from all the machines I have looked at, have been pushed from the distribution server to the computers.

Two of the three haven't installed. One tried to install and has failed on 11 machines.  The most common failures on this one update listed are:

1. Patch Deployment failed, Distribution Server is not reachable. Deployment will be retried during the next refresh interval
2. The connection with the server has been terminated or an incompatible SSL protocol was encountered .
3. The referenced assembly is not installed on your system.

I have checked these 11 machines and see that other updates have installed. I have found no reference to the third error. But it also doesn't explain why this particular updates is just sitting on 300+ machines and not trying to install. 

I've checked logs and can't find a clue to as to what it is. 

KB4493472 64b - missing on 308 machines, failed on 11. 

KB4493472 32b and KB4493448 are each failing on 30 machines. Not attempted installs that I could find.

We are running F-Secure and i've seen no mention for that in the known issues with these updates for AV software. I've gone ahead and set them to Non-Approved until we can determine the issue. 

The computers missing these updates are a combination of hardwired/wireless in corporate and remote offices with distribution servers.

Anyone else having issues with these few updates?