We are try to setup an external private repo hosted on GitHub by using the HTTPS protocoll and a `Password` within Passphrase with the right credentials:
```
[2014-08-21 13:24:06] EXCEPTION: (PhutilProxyException) Error while updating the "rCALLSIGN" repository. {>} (CommandException) Command failed with error #255!
COMMAND
'<phabricator>/
phabricator/bin/repository' update -- 'CALLSIGN'
STDOUT
(empty)
STDERR
[2014-08-21 13:24:06] EXCEPTION: (Exception) git fetch failed with error #128:
stdout:
stderr:fatal: 'origin' does not appear to be a git repository
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
at [<phabricator>/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php:313]
#0 PhabricatorRepositoryPullEngine::executeGitUpdate() called at [<phabricator>/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php:91]
#1 PhabricatorRepositoryPullEngine::pullRepository() called at [<phabricator>/src/applications/repository/management/PhabricatorRepositoryManagementUpdateWorkflow.php:60]
#2 PhabricatorRepositoryManagementUpdateWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:394]
#3 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:290]
#4 PhutilArgumentPars... (98 more bytes) ... at [<phutil>/src/future/exec/ExecFuture.php:397]
#0 phlog(PhutilProxyException) called at [<phabricator>/src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php:335]
#1 PhabricatorRepositoryPullLocalDaemon::resolveUpdateFuture(PhabricatorRepository, ExecFuture, integer) called at [<phabricator>/src/applications/repository/daemon/PhabricatorRepositoryPullLocalDaemon.php:198]
#2 PhabricatorRepositoryPullLocalDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:84]
#3 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:111]
```