TCP port connection failure

[Deborah Schwarzenbach]

We are having a problem with a port connection. When tcp tries to connect to a port it locks up and can't connect.
How do we trace the port, troubleshoot and debug it.
Are there any ndd commands that might help.
Thanks,
Debbie

[Pat Lieberg]

You can try using nettl to trace network traffic.

I've attached a document I pulled off a different forum message I found in the past.

[saju_2]

Hi

Try netstat -a

Regards
CS

[Robert Salter]

Deborah,

You could use lsof to help see what's going on with the port. Get it at;
http://hpux.cs.utah.edu/

Good luck

Robert

[Mel Burslan]

I second Robert on this one. lsof is your best option to track which process is holding a port hostage. After installing the lsof from depot, you should run

lsof -i tcp | grep port_number_here

you should see the process keeping that port open, so you can kill it if necessary.

[Raj D.]

Hi Deborah ,

If lsof is not installed , try

# netstat -a | grep port_no

This may help ,

cheers,
Raj.