No Longer Req'd-Log In Address(port 16080): http://www.xtremesystems.org:16080/forums
I've had a hell of a time trying to work this one out today.
The new server requires port 16080!!!
i.e., http://www.xtremesystems.org:16080/forums/usercp.php
If you have a firewall (hard/soft/both) like me and are having trouble logging in, make sure you open up port 16080. I could not log in without it and previously this was not required.
The issue manifests itself as 'You have exceeded your maximum failed login attempts' advices/email messages.
Also, DON'T reset your password as the message is not valid (at least, unless you think you have actually messed up your password 5 times!)
Good luck, get in, and may the XS be with you again.
[edit: can't cant cannot login logon problems-search terms for those out there still troubled and who haven't found this post]