ThinPrint Engine on a print server
Be sure that the TCP ports for communication and printing via TCP/IP are not being blocked by another program or by a server-side or client-side firewall. Default ports are:
Outbound:
- 4000 for print jobs
- 135 and 4005 for license requests
Inbound:
- 4100 for the AutoConnect high availability service
- Dynamic RPC ports (at least for the TPPrintSvc.exe)