Alert Log Errors: 12170 TNS-12535/TNS-00505: Operation Timed Out
(Doc ID 1628949.1)
Last updated on MARCH 31, 2022
Applies to:Oracle Net Services - Version 10.2.0.1 and later
Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [Release 11.2]
Information in this document applies to any platform.
The following error is reported in the database alert log.
***Note the "Client address" is posted within the error stack in this case.
Fatal NI connect error 12170.
TNS for 64-bit Windows: Version 188.8.131.52.0 - Production
Oracle Bequeath NT Protocol Adapter for 64-bit Windows: Version 184.108.40.206.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 64-bit Windows: Version 220.127.116.11.0 - Production
Time: 22-FEB-2014 12:45:09
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: 60
nt OS err code: 0
***Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=XXX.XX.XXX.XXX)(PORT=45679))
This does not correspond to the listener port.
No changes are necessary, but may have recently upgraded the database to 11g release 1 or higher, or installed a new Oracle11g database and they are now visible in the alert log.
Note: Prior to 11gR1 these same 'Fatal NI connect error 12170' are written to the sqlnet.log. This document describes a problem that arises when a firewall exists between the client and the database server.
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