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

Last updated on AUGUST 31, 2023

Applies to:

SQL*Plus - Version to [Release 9.2 to Oracle10g]
Precompilers - Version 9.2 to 10.2
Oracle Database - Enterprise Edition - Version to [Release 9.2 to 10.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
IBM z/OS on System z


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.


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