Or theymos tried to implement the new Forum Software , (but i guess not ) just kidding with that.
The most times i have seen it , it was over after few hours .
It's not a DDOS attack it's related to SSL the forum couldn't establish a secured connection so the issue is on their client-side they might some changes on SSL or they might be updating a new SSL. Since the forum SSL is registered in Cloudflare there might be an issue with Cloudflare.
According to this https://www.cloudflarestatus.com/ there is a network performance issue this might be the reason why we experienced this "SSL handshake failed" but according to them it was resolved.