Sometimes You can get “TNS-12637: Packet receive failed ” error.
Details of error are as follows.
TNS-12637: Packet receive failed
2. The machine on which the other process is running went down.
3. Some other communications error occurred.
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.