Linux: ORA-12518: TNS:listener Could Not Hand Off Client Connection
(Doc ID 2298954.1)
Last updated on JANUARY 01, 2020
Applies to:Oracle Net Services - Version 18.104.22.168 and later
Information in this document applies to any platform.
On : 22.214.171.124 version, Clusterware
When attempting to connect to database via listener,
the following error occurs.
ORA-12518: TNS:listener could not hand off client connection
15-AUG-2017 01:40:01 * (CONNECT_DATA=(CID=(PROGRAM=myapp)(HOST=__jdbc__)(USER=admin))(SERVER=DEDICATED)(SERVICE_NAME=oracle)) * (ADDRESS=(PROTOCOL=tcp)(HOST=126.96.36.199)(PORT=1521)) * establish * oracle * 12518
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. sqlplus firstname.lastname@example.org:1521/oracle
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