Failed to listen to network.

[Ceesjan van Hattum]

Hi,
I've set up some mta's listening to port 102.
But i set it up as root, and changed the
application to a different user (chown -R ..).
Now my application refuses to listen to port 102, even after a restart.
What is holding/binding port 102 to root.
This problem i can repoduce on hpux10.20 and
11.00.
Please help.

[Steven E. Protter · Accepted solution]

Nonroot users need special priviledges to monitor ports with number below 1024.

SEP

[A. Clay Stephenson]

You need to use lsof or netstat to see what application has port 102 in use. I suspect that your real problem is that you changed the user from root. Low-range ports (0-1023) are reserved for use by super-user so that I suspect the moment you changed the owner, you killed the application. Note: You could code your application to be a setuid application running with an effective UID of 0.

[Ceesjan van Hattum]

You're both correct. I wanted to listen from a lownumber port using a simple user. Using ports like 10008 was no problem.

case closed.
THNX
Ceesjan