Sometimes You can get ” ORA-03135: connection lost contact ” error.
ORA-03135: connection lost contact
Details of error are as follows.
ORA-03135: connection lost contact Cause: 1) Server unexpectedly terminated or was forced to terminate. 2) Server timed out the connection. Action: 1) Check if the server session was terminated. 2) Check if the timeout parameters are set properly in sqlnet.ora.
If you got this error from Oracle clients like TOAD, SQL Developer, PL-SQL Developer or Applications, this ORA-03135 error is related with Network issues, so you need to check and fix your Network or VPN problems.
To resolve ORA-03135 error, you should increase the value of the expire_time parameter in the SQLNET.ORA file ( under $ORACLE_HOME/network/admin/ ) .
Add the following parameter to the SQLNET.ORA file
SQLNET.EXPIRE_TIME = 100
Set the parameters sqlnet.inbound_connect_timeout and inbound_connect_timeout_listenername to 0 to solve the ORA-03135.
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