When running a cumulative update to the SharePoint 2013 farm servers, I encountered an error message in the Configuration Wizard. It stated that there were missing packages on my non-central admin servers.
This was in spite of running the same cumulative updates on all the servers (????)
When I attempted to run the cumulative update installation again, the package check came back with the following message:
There are no products affected by this package installed on this system
I tried multiple options, such as restarting IIS, the SharePoint Timer Service, and the servers themselves, however, none of those resolved the issue or allowed the wizard to detect that those updates were already installed on the other servers.
Finally I came across a post indicating that the servers should be removed from the farm and then re-added again. I did so, and that resolved the issue.