New users can't activate new sites

I have setup the pro sites plugin. When I try to register a test account I am able to go through the process, but I am unable to activate the new user and site.

The user also does not show up in the users section of any of the admin pages.

When i try to activate, I go to this link http://gollum.missionblogs.net/wp-activate.php?key=821675d09e0d5494 and then get a server not found error.