The login will work fine if you accept the certificate mismatch. If you go to the forums, then login (accepting the certificate), it will work fine.
Accepting just reloads the page but you are not signed in.
ANYWAY at the risk of asking a dumb question, aren't you already logged in?
For those that didn't read the posts on the Neowin Facebook page, you will need to login on the forums, because logging in from main doesn't work, and also accept the certificate as Dave pointed out. Or you can just wait until this is resolved.