“TNS-12531: TNS:cannot allocate memory error” – Are you sure, Oracle?

Hey guys!
So, I was working on a server build and everything was running fine until I tried to start the listerner. The process hang on “Starting /u01/app/grid/product/12.1.0/grid/bin/tnslsnr: please wait…” and then raised TNS-12531: TNS:cannot allocate memory error.

Well 1st thing, looked the error up using orerr:

TNS-12531: TNS: cannot allocate memory
Cause: Sufficient memory could not be allocated to perform the desired activity.
Action: Either free some resource for TNS, or add more memory to the machine. For further details, turn on tracing and re-execute the operation.

Should be simple right? Well, not in this case. The server had plenty of resources and not even the database was up yet so over 90% of the server memory was free.

Checked all sort of things when I started to check the server network configuration.
Looking up found that the server will through this error also when the hostname definition is different from what is resolved by the /etc/hosts file.

Once those matched, volià, listener started successfully.

Not the memory right? Oracle and its tricks…

That kept me bugging so I found this article, which shows a trace of the listener with a bit more information.

Hope this can save you some minutes on troubleshooting.

Until next time!