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TNS-12637: Packet receive failed


Sometimes You can get “TNS-12637: Packet receive failed ” error.


Details of error are as follows.

TNS-12637: Packet receive failed
Cause: A process was unable to receive a packet from another process. Possible causes are:1. The other process was terminated.

2. The machine on which the other process is running went down.

3. Some other communications error occurred.

Action: If the cause is not obvious, contact Oracle Customer Support.




This error is get during recent upgrade to 12c database.

firewall’s “Advanced SQL features”, in this case, SQL ALG (Juniper firewalls)

Disabling the  SQL ALG on port 1521 at the Juniper Firewall resolved this issue.

Please notice there are other similar firewall features like

– SQLNet fixup (protocol)
– Deep Packet Inspection or DPI
– SQLNet packet inspection


Do you want to learn more details about RMAN, then read the following articles.


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