services

[Fadia Almarei]

i have a linux server (redhat 9) at which i have vncserver running on, i have the client on my windows 2000 pc , i want to ask at which port the vnc will work as my server on the dmz,and is it necessary to have this servise on the /etc/services file or i must add it by my self.

[NiCK_76]

netstat -l

[Claudio Cilloni]

vnc server listens on port 5900 + display number.

if your vnc server is the display number :1, it listens on port number 5901.

ciao
Claudio

[Fred Ruffet]

/etc/services is only a kind of reference, programs like netstat or nmap look at to determine which protocol corresponds to which port. If you put foo in front of smtp port on your machine and issue a nmap to a host where smtp is running, it will tell you foo port is opened... So it is not necessary. It is just usefull, if you use standard ports on your machine, as long as you can't remember all ports.

Now, to know which port is use by vnc, and more generally by any process, you can use lsof utility. It should be installed by default on your redhat server (if it's not, install it, it is usefull). Use this command to know what files and ports are opened by a process :
lsof -p pid_number

regards,

Fred

[Ivajlo Yanakiev]

yes services is only reference
port /name

like hostname /ip address

Generaly X services isn't that secure.
use ssh instead VNC