Couldn’t connect to DB: The Network Adapter couldn’t establish connection

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You tried to bringing up the SAP system which installed in Oracle database environment but stuck with below error. From the JdbcCon.log,

> more /home/sidadm/JdbcCon.log
Start: Wed Jul 17 05:26:52 CEST 2013

Error: Couldn't connect to DB Exception of type java.sql.SQLException caught: 
The Network Adapter could not establish the connection.


1. Check the listener status. Ensure the listener is up and running.


You can refer to below articles which having the same error
ERROR => CONNECT failed with sql error ’12154′
SAP System Message: No connect to database, session terminated

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