62086c6be6
A sporadic failure occured on Hydra because a request was sent to the daemon after the systemd unit was started, but before the daemon was actually listening. Fix by checking for open port first.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.