title: inconsistent authentication results when trying to git clone TFS to linux
body: <p>I have the strangest thing - I have 2 linux servers:</p>
  
  <ol>
  <li>Red Hat Enterprise Linux Server release 6.9</li>
  <li>CentOS Linux release 7.4.1708 (Core)</li>
  </ol>
  
  <p>both have git version 2.14.1. both are trying to clone git hosted on TFS server (TFS2017). they both issue an error:</p>
  
  <pre><code>error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass' 
  </code></pre>
  
  <p>but afterwards they both prompt a username and password for the TFS server. after entering the user and password only the first (red hat) is managed to clone. the centos failes on </p>
  
  <pre><code>fatal: Authentication failed for URL...
  </code></pre>
  
  <p>any ideas ???</p>