title: ERROR: Registering runner… failed runner=38BUk9-k status=404 Not Found
body: <p>I'm trying to register a gitlab runner on a new installation of gitlab (based on the omnibus rpm for centos7) 
  but registration fails like this:</p>
  
  <pre><code>[root@ec2-x.y.z.w ~]# 
  [root@ec2-x.y.z.w ~]# sudo gitlab-ci-multi-runner register
  Running in system-mode.
  
  Please enter the gitlab-ci coordinator URL (e.g. https://gitlab.com/):
  http://ec2-x-y-z-w.compute-1.amazonaws.com/ 
  Please enter the gitlab-ci token for this runner:
  38BUk9-kgZkmmPHz-hsb
  Please enter the gitlab-ci description for this runner:
  [ec2-x-y-z-w.compute-1.amazonaws.com]: dcos runner 1
  Please enter the gitlab-ci tags for this runner (comma separated):
  dcos
  Whether to run untagged builds [true/false]:
  [false]: 
  ERROR: Registering runner... failed runner=38BUk9-k status=404 Not         Found
  PANIC: Failed to register this runner. Perhaps you are having network     problems 
  [root@ec2-x-y-z-w ~]#
  </code></pre>