New security warning for website

I use WS-FTP to upload to my web site. After installing
SP-2 I got a new security warning that the site was blocked
for security reasons. I unblocked it as per instructions
and still cannot get to my site properly and upload files.
I get to a root directory but my site is not there. I get
an error message:
"425 Try later, data connection in use"
Any suggestions?
TIA
Jakob