Fatal NI Connect Error 12170, 'TNS-12535: TNS:operation timed out' Reported in 11g Alert Log

Last updated on DECEMBER 28, 2016

Applies to:

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:

***********************************************************************

Fatal NI connect error 12170.

VERSION INFORMATION:
TNS for Solaris: Version 11.2.0.1.0 - Production
Oracle Bequeath NT Protocol Adapter for Solaris: Version 11.2.0.1.0 - Production
TCP/IP NT Protocol Adapter for Solaris: Version 11.2.0.1.0 - Production
Time: 22-JAN-2011 21:48:23
Tracing not turned on.
Tns error struct:
ns main err code: 12535

TNS-12535: TNS:operation timed out
ns secondary err code: 12560
nt main err code: 505

TNS-00505: Operation timed out
nt secondary err code: 145
nt OS err code: 0
Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.xxx.yy.117)(PORT=1092))

---------
The "nt secondary err code" will be different based on the operating system.

Linux x86 or Linux x86-64: "nt secondary err code: 110"
HP-UX Server: "nt secondary err code: 238"
AIX: "nt secondary err code: 78"

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