We apologize for the inconvenience of the forum being down for the past 12-18 hours. Our forum host contacted us about our SSL (Secure Sockets Layer) certificate expiring, which happens each year. We received the verification e-mail round 3am last night and have since sent the request and had it approved (which is how you're once again able to access the forum).
What is SSL?
In very simple terms, SSL is the encryption between your browser (Chrome, Safari, etc.) and the site (PG Forums) to ensure no one but those two are able to understand what's being communicated in order to create a secure environment.
Again, we apologize for the interruption in service and thanks for your patience!