安装basler相机的ros支持包时出现错误，添加依赖一直出错，貌似是连接问题吗？

Question

rosdep install --from-paths . --ignore-src --rosdistro=$ROS_DISTRO -y

ERROR: Rosdep experienced an error: Failed to load a rdmanifest from https://raw.githubusercontent.com/magazino/pylon_camera/indigo-devel/rosdep/pylon_sdk.rdmanifest: <urlopen error [Errno 111] Connection refused>
Please go to the rosdep page [1] and file a bug report with the stack trace below.
[1] : http://www.ros.org/wiki/rosdep

rosdep version: 0.21.0

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 146, in rosdep_main
    exit_code = _rosdep_main(args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 443, in _rosdep_main
    return _package_args_handler(command, parser, options, args)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 552, in _package_args_handler
    return command_handlers[command](lookup, packages, options)
  File "/usr/lib/python2.7/dist-packages/rosdep2/main.py", line 756, in command_install
    uninstalled, errors = installer.get_uninstalled(packages, implicit=options.recursive, verbose=options.verbose)
  File "/usr/lib/python2.7/dist-packages/rosdep2/installers.py", line 445, in get_uninstalled
    resolutions, errors = self.lookup.resolve_all(resources, installer_context, implicit=implicit)
  File "/usr/lib/python2.7/dist-packages/rosdep2/lookup.py", line 408, in resolve_all
    self.resolve(rosdep_key, resource_name, installer_context)
  File "/usr/lib/python2.7/dist-packages/rosdep2/lookup.py", line 499, in resolve
    resolution = installer.resolve(rosdep_args_dict)
  File "/usr/lib/python2.7/dist-packages/rosdep2/platforms/source.py", line 231, in resolve
    raise InvalidData(str(ex))
InvalidData: Failed to load a rdmanifest from https://raw.githubusercontent.com/magazino/pylon_camera/indigo-devel/rosdep/pylon_sdk.rdmanifest: <urlopen error [Errno 111] Connection refused>