RE: Fatal NI connect error 12170 in alert of Oracle 11gR2 database

From: Sweetser, Joe <>
Date: Mon, 11 May 2015 20:37:51 +0000
Message-ID: <>

Most likely nothing to be too concerned about. Take a peek at on Metalink/MOS:

Fatal NI Connect Error 12170, 'TNS-12535: TNS:operation timed out' Reported in 11g Alert Log (Doc ID 1286376.1)


From: [] On Behalf Of Mandal, Ashoke Sent: Monday, May 11, 2015 2:32 PM
Subject: Fatal NI connect error 12170 in alert of Oracle 11gR2 database


Right after I upgraded my databases from Oracle to Oracle I am seeing the following messages in the alert log repeatedly. I didn’t see these messages in 10g databases. I tried tracking down the IP address but found out that these were computers, which had been accessing the database for many years. But these messages are being logged into the alter log only after the upgrade to

Is it a known behavior in Oracle 11gR2? I did some checking with documentation but couldn’t find any explanation. So any help will be appreciated.

Ashoke Mandal

Fatal NI connect error 12170.


        TNS for Solaris: Version - Production
        Oracle Bequeath NT Protocol Adapter for Solaris: Version - Production
        TCP/IP NT Protocol Adapter for Solaris: Version - Production
  Time: 16-APR-2015 06:54:01
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= Thu Apr 16 06:54:01 2015

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-- Received on Mon May 11 2015 - 22:37:51 CEST

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