facebook like button fails on embeded forum

This is a embeded phpbbforum topic page:
http://bhuntr.com/college/viewtopic.php?f=27&t=5253

it works great! but when I want to insert a facebook like button and I test the link on linter
http://developers.facebook.com/tools/lint/?url=http%3A%2F%2Fbhuntr.com%2...

it shows:
Website inaccessible
The page at http://bhuntr.com/college/viewtopic.php could not be reached because the server returned status code 404.

Is there anyone know about this?