Liz,
The redirect on that page looks to be properly setup to go to "/~secondha/contact.html" after a successful login. If you're not going there, I'd check the following:
* Disable any SEF extensions you have enabled, or Joomla's built-in SEF, and test again
* Check for any System, User, or Authentication plugins that may be attempting to redirect the user. Disable any plugins that you're unsure about and test again.
The IP address shouldn't be a problem at all.
Finally, if none of that helps, let me know how you're trying to login: Joomla credentials or Facebook? The information above should apply to both, but to further help, we'll need more information. Also, does the redirect work for the 'other' one (if Joomla isn't working, does Facebook redirect work)?
Thanks,
Alex