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ORA-12535 or TNS-12535 'Connection timed out' Occurs. (Doc ID 1504201.1)

Last updated on SEPTEMBER 21, 2018

Applies to:

Oracle Access Manager for IMS/TM - Version 9.2.0.2 to 10.2
Oracle Net Services - Version 10.2.0.5 to 10.2.0.5 [Release 10.2]
Access Manager for CICS - Version 9.2 to 10.2
Operating System Dependent Interface - Version 9.2 to 10.2
SQL*Plus - Version 9.2.0.1 to 10.2.0.5 [Release 9.2 to Oracle10g]
IBM z/OS on System z

Symptoms

Connections from a IBM z/OS client to a remote database fail with ORA-12535 or TNS-12535 Connection timed out. The problem can also occur when attempting to use a database link when connected to an Oracle database on IBM z/OS platform.
You have read <Note 119706.1>, but none of the suggested solutions or actions have resolved the problem.

Cause

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