Hello Deepak,
Gateway is installed in the cluster environment and it is working fine.
Oracle Client path is also maintained.
One more thing.... we are facing this problem on one application node only. From other node, it is working fine.
One more doubt is... is it possible that there can be something wrong in Windows user profile because whenever I login for first time after disconnect, it throws this error but after that it works all fine.
Thanks,
Gaurav