This thread is the only response to a search for "passive mode". There are no responses to a search for "Illegal PORT command".
I think Kim's problem and mine may be connected.
When I ftp to the SME server (5.6) from my internal network and then open a proxy connection to a second server (external to my network), I can not transfer files. I get an "Illegal PORT command". The SME server is trying to open port 500.
The second server enters _passive mode_, so this is not the problem. The only client I am using is _ftp_ from a terminal session in GNU/Linux 2.4.18.
Sounds to me like a SME configuration problem. I will begin my search for where. In the meantime any response would be helpful.
Thanks
dan m