> The non-responsiveness feedback in the substituter [0] had been
> triggering a bug in our Hydra installation at http://hydra.gnu.org
> whereby the server would enter an endless loop and effectively become
> unreachable, to the point that hydra.gnu.org was hardly usable for
> substitution.

> Now the Hydra server is back to life, and the bug appears to be gone.

The server is not responding right now.  And I can't build anything even
if I use '--no-substitutes' (just like before [1]).

I'll try to fix the latter.

[1] https://lists.gnu.org/archive/html/bug-guix/2013-07/msg00000.html