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TNS-12535: TNS:operation timed out

edited Sep 28, 2016 5:00AM in Database Administration (MOSC) 3 commentsAnswered

I am trying to connect (tnsping) from a 12c client to 11.2.0.4 database. I cant tnsping to the database and get the error - TNS-12535: TNS:operation timed out. I tried to set different parameters in sqlnet.ora but it did not help.

SQLNET.AUTHENTICATION_SERVICES = (NTS)

SQLNET.EXPIRE_TIME = 120

SQLNET.INBOUND_CONNECT_TIMEOUT=120

SQLNET.RECV_TIMEOUT=120

SQLNET.SEND_TIMEOUT=120

I had started with small values and then increased deliberately just to see if it works, but it did not. Please suggest.

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