it happened more then one time on different servers (all with Windows Server 2012 R2, so maybe thats an OS related problem), that the Management Console's (QMC) web interface doesn't open.
I got the following error from the log:
HandleRequest failed: System.Net.HttpListenerException (0x80004005):
at System.Net.HttpListener.EndGetContext(IAsyncResult asyncResult) ||
at QMS.BackstageWebServer.HandleRequest(IAsyncResult iar)
I checked the services and all are running correctly.
Of course .NET Framework is installed and I tried different browsers.
Hope, you could help me with this error.