Database Networking (MOSC)

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Oracle Net Client Errors via GRID Listener: 12537, 12547, 12518

edited Nov 18, 2016 8:01AM in Database Networking (MOSC) 3 comments

This is a common problem in environments with separated 'grid' and 'oracle' users.

Remote connections via the listener can fail with any of the following errors:

ORA-12537: TNS:connection closed

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

TNS-12547: TNS:lost contact

This is usually caused by incorrect permissions on the 'oracle' executable in $ORACLE_HOME/bin.

Please refer to this document and complete the checks to confirm the 'sticky' bit is set, umask is correct,

etc.

ORA-12537/ORA-12547 or TNS-12518 if Listener (including SCAN Listener) and Database are Owned by Different OS User (Doc ID 1069517.1)

A couple quick checks from the document might reveal the problem:

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