Cannot install Local Printer Port by UNC "The Parameter is Incorrect"

We have several printers installed via local port so that they show up through TS sessions. Add printer -> local port -> \\computername\printer share. They working fine until we rebooted the server. All the jobs to these ports fail. Other printers work fine installed on the server i.e. IP ports. When we delete the local port and try to reinstall we get 'the parameter is incorrect'. On another server there are no problems adding the port with the same \\syntax. Restarted spooler, server, and can't recreate the ports without getting the above error. Kind of at a lost and would appreciate any input.