login redirects to 404

Jan,
Glad you found the issue. JFBConnect relies of Facebook to redirect the user, and they use a compression/encryption scheme for some of the contents of their URLs. Depending on what your Security Check extension is looking for, I could see it having problems with that. Most security suites that we've seen work fine with JFBConnect, but it all depends on what they do, and don't, allow.

Either way, should you need anything else, just let us know.

Thanks,
Alex