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Don Burleson Blog 







ORA-29260: network error: TNS: lost contact

Expert Oracle Database Tips by Donald BurlesonAugust 27, 2015

Question:  I am getting the ORA-29260 error when attempting to connect to my Oracle instance:

ORA-29260: network error: TNS:lost contact

How do I resolve the ORA-29260 error?

Answer:  The ORA-29260 is a sporadic error, the code works fine when the traffic is slow and fails when network traffic is high.  The ORA-29260 error is almost due to a firewall or a slow network where high packet rates cause high network latency.  There are only a few options to fic a ORA-29260 error:

- Tune your TNS network layer

- Install a faster network like Dark Fiber

- Check for blocked ports or firewalls

- Consider trying the tcp.nodelay setting in your protocol.ora file.

The documentation notes this on the ORA-029260 error:

ORA-29260: network error tips

Cause: A network error occurred.

Action: Fix the network error and retry the operation


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