我正在尝试在新安装的 Ubuntu 14.04 上获得工头主设置。我遇到的安装问题没有产生任何可搜索的结果（或者我不知道正确的词）。
在运行工头安装程序之前，我确保 'ping $(hostname -f)' 得到的是我的 IP 地址，而不是 127.0.1.1。
安装程序完成后，我留下了这个错误（机器名称已编辑）：
Could not set 'present' on ensure: 422 Unprocessable Entity at 12:/usr/share/foreman-installer/modules/foreman_proxy/manifests/register.pp
Could not set 'present' on ensure: 422 Unprocessable Entity at 12:/usr/share/foreman-installer/modules/foreman_proxy/manifests/register.pp
/Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[abc.xyz.com]/ensure: change from absent to present failed: Could not set 'present' on ensure: 422 Unprocessable Entity at 12:/usr/share/foreman-installer/modules/foreman_proxy/manifests/register.pp
/Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[abc.xyz.com]: Failed to call refresh: missing param 'id' in parameters
/Stage[main]/Foreman_proxy::Register/Foreman_smartproxy[abc.xyz.com]: missing param 'id' in parameters
从 /var/log/foreman-installer/foreman-installer.log （机器名称已编辑）：
[DEBUG 2014-12-09 16:01:31 main] Puppet::Type::Foreman_smartproxy::ProviderRest: feature foreman_api is missing
[ INFO 2014-12-09 16:01:59 main] E, [2014-12-09T16:01:59.627479 #3981] ERROR -- : 422 Unprocessable Entity
[ INFO 2014-12-09 16:01:59 main] {
[ INFO 2014-12-09 16:01:59 main] "error"[0;37m => [0m{
[ INFO 2014-12-09 16:01:59 main] "id"[0;37m => [0m[1;31mnil[0m,
[ INFO 2014-12-09 16:01:59 main] "errors"[0;37m => [0m{
[ INFO 2014-12-09 16:01:59 main] "base"[0;37m => [0m[
[ INFO 2014-12-09 16:01:59 main] [1;37m[0] [0m[0;33m"Unable to communicate with the proxy: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([RestClient::RequestTimeout]: Request Timeout) for proxy https://abc.xyz.com:8443/features"[0m,
[ INFO 2014-12-09 16:01:59 main] [1;37m[1] [0m[0;33m"Please check the proxy is configured and running on the host."[0m
[ INFO 2014-12-09 16:01:59 main] ]
[ INFO 2014-12-09 16:01:59 main] },
[ INFO 2014-12-09 16:01:59 main] "full_messages"[0;37m => [0m[
[ INFO 2014-12-09 16:01:59 main] [1;37m[0] [0m[0;33m"Unable to communicate with the proxy: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([RestClient::RequestTimeout]: Request Timeout) for proxy https://abc.xyz.com:8443/features"[0m,
[ INFO 2014-12-09 16:01:59 main] [1;37m[1] [0m[0;33m"Please check the proxy is configured and running on the host."[0m
[ INFO 2014-12-09 16:01:59 main] ]
[ INFO 2014-12-09 16:01:59 main] }
[ INFO 2014-12-09 16:01:59 main] }
[ERROR 2014-12-09 16:01:59 main] Could not set 'present' on ensure: 422 Unprocessable Entity at 12:/usr/share/foreman-installer/modules/foreman_proxy/manifests/register.pp
鉴于错误的性质，我尝试使用 Web UI 重新创建智能代理。在那里，我遇到了这个错误（机器名称已编辑）：
Unable to communicate with the proxy: ERF12-2530 [ProxyAPI::ProxyException]: Unable to detect features ([RestClient::RequestTimeout]: Request Timeout) for proxy https://abc.xyz.com:8443/features
Please check the proxy is configured and running on the host.
最后，我再次检查了代理是否正在运行：
service foreman-proxy status
* foreman-proxy is running
防火墙已关闭，并且 apt-get upgrade 已运行。除此之外，它应该是一个非常标准的 Ubuntu 14.04 安装。
有没有人遇到过这个错误？还有其他故障排除技巧可以尝试吗？
谢谢！