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When TCP/IP is installed with Windows 2000 and 2003 the TCP/IP Print Server service is automatically started. This service also uses port 515 and thus will not allow PDFing to run! Unless you are using this service to print files sent from UNIX machines, you can safely stop this service and change the start-up options to manual. Use the Services applet in the Control Panel to stop this service and then change its start up options to “manual”.