ORA-12535: Timeout Error Is Thrown When using NAT (Doc ID 270096.1)

Last updated on OCTOBER 27, 2016

Applies to:

Oracle Net Services - Version 8.1.7.4.0 to 10.2.0.4.0 [Release 8.1.7 to 10.2]
Oracle Net Services - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Information in this document applies to any platform.
This problem can occur on any platform.
Oracle clients wanting to connect to a remote database server through a firewall that uses Network Address Translation (NAT).

Symptoms

ORA-12535: TNS:operation timed out error is thrown to the client when it attempts to connect to a remote database server through a firewall that uses NAT.

Cause

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