We see the error related to Listener refused the connection with following other error message as below:
ORA-12516,TNS:listener could not find available handler with matching protocol stack.
or
Status:Failure -Test failed:IO Error: Got minus one from read call.
Usually we face the above error when number of process is not sufficient in the initialization parameter file to create additional connections.
Resolution:
Check the current process limit in V$parameter view
Connect to the correct DB or PDB if you are running 12c or above if it is a pluggable DB;
1. Alter system set processes=<new limit> scope=spfile;
2. Bounce the DB or PDB.
3. Restart the listener services.
ORA-12516,TNS:listener could not find available handler with matching protocol stack.
or
Status:Failure -Test failed:IO Error: Got minus one from read call.
Usually we face the above error when number of process is not sufficient in the initialization parameter file to create additional connections.
Resolution:
Check the current process limit in V$parameter view
Connect to the correct DB or PDB if you are running 12c or above if it is a pluggable DB;
1. Alter system set processes=<new limit> scope=spfile;
2. Bounce the DB or PDB.
3. Restart the listener services.
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