My A4000T currently runs an FTP server 24/7.
Using MiamiDX and AriadneII ethernet, gives pretty good results.
I'd highly recommend RC-FTPd by Robin Cloutman (look on Aminet). It's easy to configure, has a nice GUI and performs well.
I'm trying to get a web server running as well, but Apache is giving me lots of grief. There are a few other more basic alternatives which I might look into next.
MiamiDX comes with a basic Telnet server and seperate client, but I haven't used it much. You might be better with one from Aminet?