Microsoft.VisualStudio.Services.WebApi.VssServiceResponseException：未知主机

Question

TFS 2015.我正在构建服务器上安装VSO代理。此代理需要在其自己的AD帐户下运行。代理安装正常，但在TFS中显示为脱机。日志包含以下错误：

> 16:32:37.077613
> --------------------------------------------------------------------------- 16:32:37.077613
> Microsoft.VisualStudio.Services.WebApi.VssServiceResponseException:
> Unknown Host
> 
> 16:32:37.077613    at
> Microsoft.VisualStudio.Services.WebApi.VssHttpClientBase.HandleResponse(HttpResponseMessage
> response)
> 
> 16:32:37.077613    at
> Microsoft.VisualStudio.Services.WebApi.VssHttpClientBase.<SendAsync>d__79.MoveNext()
> 
> 16:32:37.077613 --- End of stack trace from previous location where
> exception was thrown ---
> 
> 16:32:37.077613    at
> System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
> 
> 16:32:37.077613    at
> System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
> task)
> 
> 16:32:37.077613    at
> Microsoft.VisualStudio.Services.WebApi.VssHttpClientBase.<SendAsync>d__76`1.MoveNext()
> 
> 16:32:37.077613 --- End of stack trace from previous location where
> exception was thrown ---
> 
> 16:32:37.077613    at
> System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

当我在网络服务帐户下的管理员帐户下运行代理时，它会联机。此外，在这些情况下，上述异常不会出现在日志中。我将服务帐户用户添加到服务池的Agent Pool Administartor和Agent pool Service Account组，但这没有帮助。它错过了哪些权限？