forums.raspberrypi.org was a domain name used for internal monitoring of the back-end server that was never intended to be public.
When we did the migration of the forums we moved to a new backend VM on a different IPv6 address. Since we're now complete we've switched off the old VMs so the servers have gone away. For the last week forums.raspberrypi.org has been out of date pointing at the old servers.
I'm not going to re-enable it for the following reasons,
- Direct public access to the back-end was never intended to be available
- In future we may have multiple back-end web servers and it'd need to be load balanced
- It doesn't support SSL and we don't want to allow insecure logins
- A future upgrade intends to migrate to Proxy-Protocol to simply our configuration which will stop it working
The supported URL is
https://www.raspberrypi.org/forums