title: Git: Received HTTP code 503 from proxy after CONNECT
body: <p>I checked a lot of post related to this issue, but nothing seems to fix my problem. So now I hope you guys can give me the magic answer.</p>
  
  <p>I'm using Intellij (but also tried it with SourceTree) to pull/push/clone a repository from Fisheye. However I'm receiving the error: </p>
  
  <pre><code>git -c diff.mnemonicprefix=false -c core.quotepath=false fetch origin
  
  fatal: unable to access 'https://myUser@myUrl/fisheye/git/myRepo.git/': Received HTTP code 503 from proxy after CONNECT
  </code></pre>
  
  <p>Hints about 503 means a temporary downtime due to maintenance don't work for me, since this issue last for a week now.</p>
  
  <p>Hints about wrong/missing proxy settings don't seem to work either. I setup http and https proxy for system git and for the IDE (Intellij).</p>
  
  <p>It worked before, I was able to clone the repository. Then I created a new branch, made some changes and wanted to push it back to the master.</p>
  
  <p>I really looking forward for some clever tips.</p>
  
  <p>Thanks so far</p>
  
  <p><strong>UPDATE</strong></p>
  
  <p>I added:</p>
  
  <p><code>export GIT_TRACE_PACKET=1</code>
  <code>export GIT_TRACE=1</code>
  <code>export GIT_CURL_VERBOSE=1</code></p>
  
  <p>and I received the following <strong>log</strong>:</p>
  
  <pre><code>$ git fetch
  trace: built-in: git 'fetch'
  trace: run_command: 'git-remote-https' 'origin' 'https://Username@myWebService.de/randomGit.git/'
  * Couldn't find host myWebService in the _netrc file; using defaults
  *   Trying 15.46.16.11...
  * Connected to myProxy.com (15.46.16.11) port 8080 (#0)
  * Establish HTTP proxy tunnel to myWebService.de:443
  &gt; CONNECT myWebService.de:443 HTTP/1.1
  Host: webapp-entw.mlp.de:443
  User-Agent: git/1.9.5.msysgit.1
  Proxy-Connection: Keep-Alive
  Pragma: no-cache
  
  &lt; HTTP/1.1 503 Service Unavailable
  &lt; Cache-Control: no-cache
  &lt; Pragma: no-cache
  &lt; Content-Type: text/html; charset=utf-8
  &lt; Proxy-Connection: close
  &lt; Connection: close
  &lt; Content-Length: 732
  &lt;
  * Received HTTP code 503 from proxy after CONNECT
  * Closing connection 0
  fatal: unable to access 'https://Username@myWebService.de/randomGit.git/': Received HTTP code 503 from proxy after CONNECT
  </code></pre>