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How to fix ORA-12541: TNS:no listener?
ORA-12541: TNS:no listener I get the ORA-12541 error message when I try to connect through sqldeveloper/Navicat. I’ve started the listener also. I’ve checked the listener.ora and tnsnames.ora files and everything seems okay. There is a root Cause: Listener for the source repository has not been started. Action: Start the Listener on the machine where the…