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How find the port being used on a network printer.

Problem:  I'm trying to find out what port # is used on a particular network printer.  I know the IP but I don't know the port.  Is there a command or something I can type or do to find out?
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rortiz77
Asked:
rortiz77
1 Solution
 
dalton1976Commented:
If it a Jetdirect, you can connect on it with telnet:


telnet "ip address"

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rortiz77Author Commented:
MESSAGE:
Connecting To 10.###.###.###...Could not open connection to the host, on port 23: Connect failed

If the printer is on a different port and Telnet is trying to connect via port 23 it work work right?  This is a Epson DFX 5000+ printer.  It was originally purchased back in '95.  
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dalton1976Commented:
So it's not a jetdirect...

the port 23 (Telnet) is used on jetdirect to manage the box.  But you print using port 515 or 9100.

What is the brand and model of you printserver box?

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technicalcareCommented:
Looking at the Epson support website, it would appear that the DFX 5000 didn't come with a built-in network card.  It only has parallel and serial connection. What are you using the share the printer? That is, what is the parallel cable (coming out of the back of the printer) plugged into?
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hdhondtCommented:
The port # used depends on the protocol used by the TCP/IP port on the PC. If the port is set to "Raw" (under the Configure Port button) then it uses port #9100. If it is set to LPR, then the port # is 515.
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BibliophageCommented:
http://insecure.org/nmap/download.html

Download and install NMAP for windows on one of your machines.  

Run it against the IP address of the printer or print server in question.

That will give you a starting point, by listing all of the open ports on the box.  

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