Is that your username,
toastedpenguin@extgreme-hq.com? It doesn't seem right and would usually be just toastedpenguin (without the @).
Also note that if you have firewall port 21open for FTP that you will be able to FTP into sites.. However, if you are using "Passive" mode it will try to transfer files (and list directories) on random, high-level ports such as 21234. When I use a firewall on servers I always switch FTP to "Active". This causes FTP to use port 21 for everything.