UNIX: TNS-12518,TNS-12536 When Listener Load Increases
(Doc ID 1920559.1)
Last updated on FEBRUARY 15, 2023
Applies to:Oracle Net Services - Version 126.96.36.199 to 188.8.131.52 [Release 11.2]
Information in this document applies to any platform.
During heavy load testing, the following errors are reported in the listener log and the connection are rejected:
TNS-12518: TNS:listener could not hand off client connection
TNS-12536: TNS:operation would block
TNS-12560: TNS:protocol adapter error
TNS-00506: Operation would block
Linux Error: 11: Resource temporarily unavailable
The issue can be reproduced at will with the following steps:
1. Run load test
The issue has the following business impact:
Due to this issue, remote client connections are failing and the listener log is throwing errors.
This is likely a new installation or there has been a significant increase in the number of incoming connections.
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