title: Jenkins - Error fetching remote repo 'origin'
body: <p>I'm trying to setup the Jenkins Github Pull-Request Builder on a Jenkins node slave, however when I set the refspec to <code>+refs/pull/*:refs/remotes/origin/pr/*</code>.</p>
  
  <p>The build fails, saying that I couldn't fetch the repo, When the refspec removed, keeping everything else in place (Github pull request builder ticked and configured, branch specifier is set to ${sha1} defaulted to master using string parameter, the build is fine.</p>
  
  <p>Here is the error trace:</p>
  
  <pre><code>git -c core.askpass=true fetch --tags --progress git@github.blah.company.com:organization/repository.git
  +refs/pull/*:refs/remotes/origin/pr/*
  ERROR: Error fetching remote repo 'origin'
  hudson.plugins.git.GitException: Failed to fetch from git@github.blah.company.com:organization/repository.git
      at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:763)
      at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1012)
      at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1043)
      at hudson.scm.SCM.checkout(SCM.java:485)
      at hudson.model.AbstractProject.checkout(AbstractProject.java:1277)
      at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:610)
      at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
      at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:532)
      at hudson.model.Run.execute(Run.java:1741)
      at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
      at hudson.model.ResourceController.execute(ResourceController.java:98)
      at hudson.model.Executor.run(Executor.java:408)
  Caused by: hudson.plugins.git.GitException: Command "git -c core.askpass=true fetch --tags --progress git@github.blah.company.com:organization/repository.git +refs/pull/*:refs/remotes/origin/pr/*" returned status code 1:
  </code></pre>
  
  <p>Any help would be greatly appreciated.</p>