Oracle Listener refused connection ORA-12519 troubleshooting

Platform

Oracle database 11gR2 (11.2.0.2.2)

Problem

New database connection attempts to Oracle database 11gR2 fail with following Oracle error:

Listener refused the connection with the following error: ORA-12519, TNS:no appropriate service handler found   [SQLCode: 12519], [SQLState: 66000] None None

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