QuoteTunnelbroker.net users are already enrolled in the program, and should use their username/password for Tunnelbroker.net to log in.
I could not use my tunnelbroker ID/PW to log in to the certification function, but successfully did log in to the tunnel maintenance section (and of course, here) - so I know my ID/PW combination is valid. Are you certain you copied the ENTIRE database of users over to the new function?
The login uses the same database. Should be working. Works for all of our tunnel testing accounts so far.
I just tried again. Logged out completely. Opened two browser windows:
1) http://www.tunnelbroker.net/ - logged in successfully, and
2) http://ipv6.he.net/certification - fails: "Either your username or your password are invalid."
It doesn't appear that my ID/PW work there. If it makes a difference, my tunnel is at the Los Angeles PoP.
Found the problem - JAVASCRIPT REQUIRED for the site.
By default, I always have javascript DISABLED due to its security risks.