Error 501 SITE option

First time user just getting started and I get this error.

331 User name okay, need password.
PASS (hidden)
230 User logged in, proceed.
SITE pcu.net
501 SITE option not supported.
Cannot login waiting to retry (30s)...

I have changed to SSL and toggled back and forth between passive and active modes. I get the sneaking suspicion that I'm looking for love in all the wrong places. Scanned all the old calls for help, so that I would not be wasting anyone's time. Just wondering if anyone else has experienced this error or may happen to know how to fix the problem.