I downloaded Serv-U and setup a domain on my local box that has Vista installed. I set the IP to an internal IP, security is SSL/TLS only on port 990. I'm using CORE FTP to connect. When I try to connect using port 990 and AUTH SSL option, I get this message:
can't establish connection to 192.168.66.1 port 990.
I then downloaded FTPVoyager (by people that made serv-u) and it says:
431 unable to negotiate secure command connection
If I set Serv-U to accept connections on port 21, and accept regular and SSL connections, I can connect without problems. I'm also prompted to accept the certificate.
Why doesn't port 990 with "SSL only" not work?