TNS could not resolve the service name

I'm using Oracle on Linux(Red Hat7.3)
I'm first of all new to this OS..
Plz tell me, to access the oracle server which is in remote what I need to configure apart from the tnsnames..
herewith I'm attaching the tnsnames.ora file which I'm using..
Plz help me out..
thanx in advance..
Pratheesh

The listener should be running on the remote server where the DB is.

check out your name in the tnsnames.ora file again you are trying to connect with wrong service name.

Shailendra