Hey...I know your problem. Pretty bad an outside programmer can solve the issue before the support guys do.

You need to have port forwarding enabled for the specific port (in this case the default port of 21 for FTP purposes).

It's real simple (if you are unsure):

1. Gain access into your router's settings.
2. Navigate to the 'Port Forwarding' or 'Applications & Gaming' tab.
3. Give this specific port a name like "SB FTP".
4. Enter 21 for the port number you wish to forward through the router. Be sure to check or select TCP for this. Specificity!
5. Enter the IP address of your computer (the one you will be doing the uploading from utilizing SetupBuilder).

And "BTW, all people who reported this tested it with the latest versions and it fixed it." is not a proper response due to lack of experience and applied knowledge.

I know this will solve your problem. Good day

The Jerry