ssh server and client not communicating

I'm encountering a strange ssh problem that I just can't quite figure
out.

Below desc what I'm doing:
I've writen a simple java program that uses java Runtime to run a Putty
plink command (Note:plink command is equivalent of ssh command in
openSSH). It works fine when I run it on my PC as stand alone java apps
and it also work fine when I run it in a servlet. However, when my
co-worker run it. It works when she run it as a stand alone java apps
but it failed (hung) when she run it in a servlet, which run in a
Websphere 6.1 server.

When I did a netstat on iseries, I see this:
Opt Address Port Port Idle Time State
10.50.16.82 3440 ssh 000:03:11 FIN-wait-2


When she did a netstat on her PC, she see this:
TCP 10.50.16.82:3440 10.100.50.14:22 CLOSE_WAIT
3020



It seems like her PC is wait on something from iseries ssh server and
the iseries ssh server is waiting for her pc for something. The
puzzling part is that it works fine when she run it as a stand alone
java app.