Don't use COM ports, just get an extra LPT port for the system that the printers are connected to. Connect them both up at the same time, create a share for each (say \\printserver\dotmatrix and ...
On our existing 2003 server I configured a shared printer that prints to a redmon port that pipes through Ghostscript and outputs into a shared folder on the server. It's basic but it works ...
When printing a document on a network printer or shared printer, this error frequently happens because the login credentials that you are providing are invalid or do ...