Wsus not updating all computers
Looking up the error it talks about a connection issue being the cause but there is nothing different or unique about the 15 computers that have the problem.
I have tried a lot of the normal client repair options but nothing seems to work.
Alternatively, you can set the application to generate an ISO file containing all the grabbed files or copy all the updates to a specific location.
However, in order to make sure that you have the latest fixes at all times, you must use it more frequent that you might want to.
Important Due to naming changes, older terms like CB, CBB and LTSB may still be displayed in some of our products.
In the following settings CB refers to Semi-Annual Channel (Targeted), while CBB refers to Semi-Annual Channel.
In addition to WSUS 4.0, you must install the KB3095113 and KB3159706 patches on the WSUS server.
To use WSUS to manage all Windows updates, some organizations may need access to WSUS from a perimeter network, or they might have some other complex scenario.
Focusing on functionality rather than looks, the application features a simplistic interface that only comprises a few options dedicated to customizing the downloading operation.