Connection lost while working on oracle developer 6i ?

As-Salamu Alaykum
We have oracle apps 11.5.10.2 production database 10.2.0.4 working on platform windows 2003 R2 connected behind a cisco firewall .
while our developer works on oracle developer 6i (using DEV schema ) , connection lost with database
1 - No sqlnet.ora file exist (i renamed it to .old )
2 - connection lost on different periods of time .
3 - Ping (cmd - > ping ) to the server is fine with no disconnections .
4 - i checked alertlog file but i couldn't find any indications about connection problem (no ora errors ) .
Your help is much appreciated.
Ahmed Hamdy
Oracle Apps DBA

Wa Alikum Al-Salam We Rahmatu Allah We Barakatu...
problem when connect.
and http://www.orafaq.com/forum/t/83142/2/
Hope this helps...
Regards,
Abdetu...

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