No solution, no FTP

Hello.

I can not FTP from my home network. I am out of options and need ideas.

I'm used several different FTP clients, the result are "no host" or "server unreachable", etc.

I called my hosting service and they say everything is fine on their end. I've attempted to ftp to other accounts, with no change.

I called my internet provider and they said there is not issue on their end.

I switched to a secondary mac tower, no change. I switched to a pc, no change, same results.

Port 21 tests do not appear to go through.

I replaced my modem/router with a newer Motorola SBG901. No change.

I am out of ideas. please anyone help!

...via the boards, I have attempted both active and passive ftp options, with no change.
...I attempted editing firefox about:config, no effect.

Have you tried different servers as well, or just trying to connect to the same server?

Have you tried different browsers? (IE, Chrome, Safari, etc..)

Thanks for your input! Unfortunately, I've tried different servers. ...pulling out hair!