Thanks for all the comments,

But im i little confused. Correct me. Jurij dear, do u mean that if we bought 30 named-user license on AIX (Oracle gave us the AIX cd installer pack). I can also run another 30 users connecting to a
Windows DB Server, another 30 users connecting to a Linux DB server,
and another 30 users connecting to HP-UX DB, so a total of 120 user
connections to 4 different servers?

For psychofun...thanks a lot for your help honey...keep up the
good work. So u mean i need to install the AIX patch IY59082.
As of now im still on test phase. Dang! I always encounter this
sqlnet connection error everytime I install new DB server.

My current problem is sqlnet connection error. I know its a simple
problem but it just made me crazy.