yep we had packet captures that showed traffic both inside and out.
The ftp server my users are trying to connect to is accessible with no issue, from every other network / internet connection I have access to (6 different sites), and with as many different clients. Windows, Linux, smartphone. The ONLY site I cannot connect from successfully is those behind the PFsense ( and monowall) firewalls running i have tried on this Vmhost.
A windows server on the same vmnetwork but outside the firewall can ftp OK.
The FTP server running behind this same vmhost, shows the same issues when trying to connect from outside regardless of what firewall I use. From within the VM network, I can connect to the ftp service running internally withing the protected network as long as do not have the firewall as the default gateway.
It seems that any connection to an FTP server that has the firewall in the path in any fashion fails.
As i mentioned all was working successfully with no changes to any of the clients, hosts, and networks up until the Vmserver was forced down.
The only thing I can now try is to replace the vmhost host itself ( or reinstall ESXi ) and see if the problem still persists.
The vmhost is the only place it can be failing.
Ken