It's probably your internet
My computer is giving me 404 bad gateway error when I try accessing DDF main topics page. The problem started when I installed Panda antivirus.
Connection ProblemsSorry, SMF was unable to connect to the database. This may be caused by the server being busy. Please try again later.
Sorry.Mandatory security patch: http://aws.amazon.com/security/security-bulletins/mysql-5-5-and-5-6-security-advisory/
Well it's all better now. No worries.