Guys I think this is a password hijacking attempt, don't do it!
You get the message:
A username and password are being requested by http://cdn.socialknowledge.com. The site says: "Forum Admin"
It is not your log in and password that you put at the top right corner! If you (or anyone else reading this!) have typed your password in, I would strongly suggest changing it this very moment!
Please note you can log in regularly in the upper right corner, and if you click "CANCEL" the pop up window eventually goes away.
Hopefully an admin will chime in here with what is going on.