wrong established connections in netstat

[Antonio Cardoso_1]

Hi,

On a HP-UX 11.11, looking at netstat or lsof, I find several TCP connections with ESTABLISHED status that no more exist on the remote host.
For example:
tcp 0 0 192.168.10.10.6121 192.168.10.20.1204 ESTABLISHED
tcp 0 0 192.168.10.10.5101 192.168.10.20.4690 ESTABLISHED
tcp 0 0 192.168.10.10.5001 192.168.10.20.1201 ESTABLISHED

192.168.10.10 is my HP server, with processes still having ESTABLISHED connections to 192.168.10.20.
On 192.168.10.20, none of these connections exist.
All of these connections are Corba connections opened by applications running Java 1.4.2_04 / Jacorb 1.4.1.12

Is this caused by some applicative incorrect behavior?
Are you aware of some system parameter that would detect/close these "ghost" connections?

thanks.

[Steven E. Protter]

Shalom Antonio,

This is caused usually by poor code in the java server.

Make sure its completely patched and the applicaiton itself checked as well.

SEP

[Ivan Ferreira]

It seems that the applications is not closing correctly the connection. Your applications should be checked.

You may want to try enabling tcp keepalive.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=974906

[Antonio Cardoso_1]

Hi SEP and Ivan,

I audited with HPJConfig recently and found no missing patch on server side.

The tcp_keep_alive is configured with system default settings (2 hours):
root # ndd -get /dev/tcp tcp_keepalive_interval
=> 7200000
but this doesn't seem to detect anything...

Connections are controlled by ORB, so I will look for some discussions in JacORB forums.

[Antonio Cardoso_1]

Found a jacorb property, and will check if
setting jacorb.connection.server.keepalive=on changes something...