ORA-12535 or TNS-12535 'Connection timed out' Occurs.
(Doc ID 1504201.1)
Last updated on FEBRUARY 07, 2020
Applies to:SQL*Plus - Version 220.127.116.11 to 10.2.0.5 [Release 9.2 to Oracle10g]
Precompilers - Version 9.2 to 10.2
Oracle Database - Enterprise Edition - Version 18.104.22.168 to 10.2.0.5.0 [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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