Hello,

Yes, hydra is currently off-line for maintainence. You can find the
relevant thread here[0]. It was suggested to use
'https://berlin.guixsd.org' as the primary source of substitutes.

For examples, I add the following option to 'guix-daemon.service':
  --substitute-urls='https://berlin.guixsd.org https://mirror.hydra.gnu.org https://hydra.gnu.org'

Cheers,
Alex

[0]: https://lists.gnu.org/archive/html/guix-devel/2018-11/msg00016.html

rohit yadav <rohityadav@utexas.edu> writes:

> Hi,
>
> After installing the guix on my ubuntu workstation. I am finding the following error when
> trying to install guix-locales. Apparently, the https://mirror.hydra.gnu.org returns 504 . I am
> not sure if the server is down or something else is wrong.
>
> #+begin_log
> substitute: guix substitute: warning: while fetching
> 'https://mirror.hydra.gnu.org/nix-cache-info': 504 ("Gateway Time-out")
> substitute: guix substitute: warning: ignoring substitute server at
> '"https://mirror.hydra.gnu.org"'
> #+end_log
>
> Thanks,
> Rohit