How to release a locked port number

[kvsheejith]

I am using hp unix 11.0. If i restart some of my applications it's port number is getting locked, For example i have UGS application and it's port number is 28000, if i am restarting my UGS application hpux will not able to release the port for re-use.

How do i release one locked port number in HPunix?

[Robert-Jan Goossens]

Hi,

Try to locate the process with lsof keeping this port locked.

http://mirrors.develooper.com/hpux/lsof-4.80-11.00.sd.bz

# lsof -i tcp:28000

Regards,
Robert-Jan

[rick jones]

"Locked" probably isn't quite the correct term.

Unless the application sets SO_REUSEADDR() before calling bind() with the well-known port number, not only will any previous instance of the application with a socket bound to that port need to be closed, but also (IIRC) all the TCP endpoints in TIME_WAIT etc will have to clear-out.

And since you mention 11.0, "insert usual suggestion to upgrade to a supported OS revision here" :)

[Kapil Jha]

well port is used only if some process is accessing it.
Probably you may stop the service and then try
lsof to find which process is using this port.
Kill that process and restart the process.
Should help.
Anyways 11.00 is out of support, you should upgrade you OS.

BR,
Kapil+

[kvsheejith]

I am able fix that problem.

Thanks lot.

[Sunny123_1]

Hi



whats is that??? If you are now able to fix that problem then you should explain here what is the solution you got so in future it can help others if same problem occurs.

Regards
Sunny

[kvsheejith]

First i made my application down and

In /vat/tmp/ one lock file will be there which ends with my application name that i have deleted

Then started my application and it started with out any issues

My application is UGS software.

Thanks
Sheejith

[Horia Chirculescu]

The existence of some lock file for any application does not mean that the port that it is used by that server application is locked!

Best regards
Horia.