When populating printers from the PaperCut Print Provider, printers will be prefixed with the machine name, even if the printers are on the same system as the Application Server. In this list the printer names will appear as server-name\printer1.
A PaperCut administrator has recently submitted an issue where printers were suddenly re-added to the Printers list with localhost as the server name, meaning they had both a server-name\printer1 and a localhost\printer1 in this list. This can cause issues when running reports, as the printer will now report jobs on the localhost printer.
The administrator found that an SSL certificate on their print server had recently expired, and the only visible effect witnessed was the server reporting as localhost as the hostname. Once the certificate was renewed, the server started reporting the correct hostname.