Hai
In my company i have two Enterprise3.0 linux servers. 2 months ago we installed & configured Oracle.
Ex: Server: DB1
ServerB2
Now i am getting problem with those servers using ssh. From the client side if any user wants to connect that he able to connect DB1, but after some time sshd closed the session. Its giving the following errors.

1. Connect to host <IP address> port 22: No route to host.
2. sshd (pam_unix) [1803]: session closed for user oracle.
3. sshd (pam_unix) [1847]: authentication failure; logname = uid=0 euid=0 tty=NODEVssh ruser= rhost= <ipaddress> user=oracle.

anybody tell me the solution plz.

kris

Does the user get a login and then after a period of inactivity the session is closed ?

Looking at the info you are presenting, this does not look like it has anything to do with your oracle installation, but with your SSH setup.

Are you using password or key based authentication ?

If you're getting "no route to host" it sounds like your networking is not setup properly. Either the subnet mask on the client is wrong, or there's a misconfigured router in the mix some where.