access to Subversion links forbidden?

[Martin Sebor via Gcc]

I've been getting Error 403 (Forbidden - You don't have permission
to access /viewcvs on this server) following the Subversion links
in Bugzilla for some time now (they worked for me before the switch
to Git, but I'm not sure if they also did before the recent hardware 
upgrade).

For example:
  https://gcc.gnu.org/viewcvs?rev=268827&root=gcc&view=rev
  https://gcc.gnu.org/viewcvs?rev=267096&root=gcc&view=rev
  https://gcc.gnu.org/viewcvs?rev=244881&root=gcc&view=rev

Are they supposed to work and if so, is anyone else having trouble with
them and is it a known problem that's already being worked on?

Thanks
Martin