12c: Listener Registration Issue: LREG Stops Providing Updates to Listener (Doc ID 2402562.1)

Last updated on MARCH 31, 2022

Applies to:

Symptoms

LREG stops updating the listener.  The service may initially register but then over time, no updates occur.

This can result in any of the following errors:

TNS-12516

ORA-12520

TNS-12519

The instance will reach its limit for connections. However, because LREG can no longer update the listener with load information, these errors may start to occur.

Changes

 This may occur after an upgrade, patchset application or change to sqlnet.ora file that resides in the same home where the listener runs.

Example, $GRID_HOME/network/admin/sqlnet.ora

Cause

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