I was doing a standard PCI scan from one of the CC vendors. The scan results came back with a port that was open on 50001. This was not a port I normally use, so I did a quick nmap scan from one my VPS providers. Sure enough the port was showing open.

I was puzzled and quickly audited my firewall rules. Nothing pertaining to port 50001 stuck out at me. Nmap was showing that it was open so I tried to telnet to it and sure enough I could connect via telnet.

I decided to contact support and after they looked at my config files, they confirmed this was a bug in 12.4. They suggested we upgrade to 12.4.1 and it would fix the issue.

The 12.4.1 fireware did fix the issue.