Versions 11, 12 and Newer Databases: Fatal NI Connect Error 12170, 'TNS-12535: TNS:operation timed out' Reported in Alert Log
(Doc ID 1286376.1)
Last updated on JANUARY 16, 2025
Applies to:
Oracle Net Services - Version 11.1.0.6 to 12.2.0.1 [Release 11.1 to 12.2]Oracle Database - Enterprise Edition - Version 19.12.0.0.0 to 19.12.0.0.0 [Release 19]
Oracle Cloud Infrastructure - Exadata Cloud Service - Version N/A and later
Gen 2 Exadata Cloud at Customer - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.
TNS-12170, ORA-12170, TNS-12535, TNS-00505 alert.log
Symptoms
nt secondary err code: 110 Monitoring of the 11g database Alert log(s) may show frequent timeout related messages such as:
- On Oracle Solaris:
Changes
No changes are necessary, but may have recently upgraded the database to 11g release 1 or higher, or installed a new Oracle11g database.
Note: Prior to 11gR1 these same 'Fatal NI connect error 12170' are written to the sqlnet.log
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |