Tnsping works but sqlplus gives error

Hi,
I have my db configuration in tnsnames.ora file.
My ping and tnsping to the server works. But when I say sqlplus usrid/pwd@db not working it is giving "TNS could not resolve identifier" error. I checked the usrid and pwd. they are correct.?
What am i missing?

Try this :
- Check which services are currently known by the listener by executing: lsnrctl services <listener name>
- Check that the SERVICE_NAME parameter in the connect descriptor of the net service name used specifies a service known by the listener.
- Check for an event in the listener.log file.
Send us the Status of lsnrctl and tnsnames you tried ..

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