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ORA-12518: TNS:listener could not hand off client connection


You may get below error when trying to connect to the database using sqlplus or through an application login.

ORA-12518: TNS:listener could not hand off client connection



Reason:
The process of handing off a client connection to another process failed.


Solution;
 Increase PROCESSES initialization parameter.


Use the following command to check the value of the PROCESSES initialization parameter:

show parameter processes;


If the database was started using an spfile, then the following command can be used to increase the PROCESSES initialization parameter:

alter system set processes=600 scope=spfile;

If the database was started using a pfile, then the value of the processes parameter must be changed in the pfile and the database bounced.


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