FYI,I applied the latest Windows updates to my Server 2012 R2/Uniprint 9 machine and after the required reboot, all my client machines could no longer print. They all got a dreaded failed to connect on port 28203 message. I went through the process of uninstalling the updates and the problematic update appears to be KB3034348.https://support.microsoft.com/en-us/kb/3034348 After removing that update and rebooting the server (again) all clients are again able to print. During this whole ordeal, all Pharos services were up and running and server logs do not show any issues either. For the time being, avoid that update!