What website are you talking about specifically?
I just checked and... yep, 404 for me. Curiously, threads that were opened years ago are working fine, while threads from the past few hours or so are giving that 404 error...
@Semaphoric Sadly, the link you've posted is only for questions about this forum.
We're sorry about the trouble caused.
The GetSat site developers have been notified and they are working on this issue now.