Linux: ORA-12518: TNS:listener Could Not Hand Off Client Connection
(Doc ID 2298954.1)
Last updated on JANUARY 22, 2025
Applies to:
Oracle Net Services - Version 11.2.0.4 and laterOracle Cloud Infrastructure - Exadata Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Gen 2 Exadata Cloud at Customer - Version N/A and later
Oracle Database - Enterprise Edition - Version 19.22.0.0.0 and later
Information in this document applies to any platform.
Symptoms
On : 11.2.0.4 version, Clusterware
When attempting to connect to database via listener,
the following error occurs.
ERROR
-----------------------
ERROR:
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=11.22.33.44)(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
STEPS
-----------------------
The issue can be reproduced at will with the following steps:
1. sqlplus user/password@11.22.33.44:1521/oracle
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |