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Old 04-25-2002, 03:41 PM   #1
Registered: Aug 2001
Distribution: Debian Etch
Posts: 510

Rep: Reputation: 31
open ports question

Hey I ran nmap on my system, and it reports some ports open. I don't know what some of these services are so I want to ask you guys:

Port       State       Service
22/tcp     open        ssh
111/tcp    open        sunrpc
139/tcp    open        netbios-ssn
515/tcp    open        printer
631/tcp    open        cups
6000/tcp   open        X11
What is sunrpc? What is netbios-ssn? What is cups? What is X11? Thanks.
Old 04-25-2002, 07:26 PM   #2
Registered: Apr 2002
Location: Italy
Distribution: RockLinux
Posts: 35

Rep: Reputation: 15
I'm not too sure but:
sunrpc - (Remote Procedure Call) is used by some daemons as NFSd (I think)
netbios-ssn - (samba) for smb windows networking support
cups - (Common Unified Printing Service) self explaining
X11 - for remote connections to your X server (oversimplifing XServer is the base layer on which programs refer for a grafical interface) : effect is something similar to VNC
Old 04-25-2002, 07:35 PM   #3
Registered: Aug 2001
Distribution: Debian Etch
Posts: 510

Original Poster
Rep: Reputation: 31
Ok, I removed sunrpc and cups, since I don't use them.

What is printer 515?

Also, is there a way to make X11 open an ssh port instead of the regular 6000 port (I don't want someone to get the password by snooping on the stream).
Old 04-26-2002, 05:03 AM   #4
Registered: May 2001
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If you `cat /etc/services | grep 515` it would show something like "printer spooler (lpd)". If no one will use your box to remotely print their docs to, disable lpd in the startup scripts.
For X11 to not listen on tcp 6000 look here its got the answers for manual starting (startx in runlevel 3) or graphical login (xdm, runlevel 5).


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