ORA-21535 error - oracle timeout issue -

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I get an ORA-21535 error in the Oracle warning log file. My application is working fine in the first few hours. After that I am expiring time. 

  TNS-1235: TNS: Operation timed out secondary error code: 12560 NT main error code: 505 TNS -00505: Operation timed out. Error code: 110 NT OS Error code: 0 Customer address: XXXXXXXXX

Note: I have no other logs except the "Alert Log".

You probably resolve your problem by setting the SQLNET.EXPIRE_TIME parameter in your Oracle server's sqlnet.ora can do.

With this parameter the database will check the application server in every number where n is the setting number.


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