Testfbtk3-developer-edition.na14.force.com access issues may stem from misconfigured redirection settings across different versions. If so, the links below can serve as alternative ways to reach the site:

http://testfbtk3-developer-edition.na14.force.com https://testfbtk3-developer-edition.na14.force.com

Or return to the current status page of testfbtk3-developer-edition.na14.force.com.