No. The moment right now running gives the error: # guix pull Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git '... Building from this channel:   guix      https://git.savannah.gnu.org/git/guix.git     ad8a4a6 substituting /gnu/store/9acqfn7g6nfgvcrzkq84dlc69ps8b2vg-git-2.19.2.tar.xz... guix substitute: error: connect: Connection timed out substitution of /gnu/store/9acqfn7g6nfgvcrzkq84dlc69ps8b2vg-git-2.19.2.tar.xz failed guix pull: error: build failed: some substitutes for the outputs of derivation `/gnu/store/c1mzmfkmxcimgyq0322bx3044qi1llqi-git-2.19.2.tar.xz.drv' failed (usually happens due to networking issues); try `--fallback' to build derivation from source Berlin works: # guix pull --substitute-urls=https://berlin.guixsd.org Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git '... Building from this channel:   guix      https://git.savannah.gnu.org/git/guix.git     ad8a4a6 updating substitutes from 'https://berlin.guixsd.org '... 100.0% updating substitutes from 'https://berlin.guixsd.org '... 100.0% Computing Guix derivation for 'x86_64-linux'... | nothing to be done # traceroute hydra.gnu.org traceroute to 20121227-hydra.gnu.org (18.4.89.46), 64 hops max   1   x.x.x.x  1.567ms  0.801ms  0.752ms   2   x.x.x.x  1.850ms  3.188ms  4.537ms   3   x.x.x.x  6.246ms  8.411ms  6.997ms   4   212.73.250.154  47.733ms  49.409ms  52.103ms   5   *  *  *   6   *  *  *   7   4.53.48.98  160.639ms  161.683ms  161.171ms   8   18.69.9.1  160.537ms  161.068ms  160.717ms   9   18.69.1.2  157.535ms  157.356ms  156.771ms  10   18.123.55.2  160.199ms  161.479ms  160.308ms  11   18.4.89.21  158.786ms  158.635ms  161.484ms