Had an issue with an oracle database
tnsping worked but connecting to the database failed.
This oracle setup used some VIPs (Scan IPs) and real DB server IP's.
Only access to the scan IP's was requested so FW was blocking the rest.
TNS-12502 error was returned from the server.
The way I could see it working in the packet captures was the client connects to the scan ip which returns the IP of the real DB server, then the client connects to the real DB server IP.
So TNSping worked, however when they tried to connect to the DB server it failed
To resolve grant access to all VIPs and real server IPs
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