Power BI Report Server upload error

This was in the RSHostingService log when I tried to upload the pbix file again.

2017-05-30 10:16:08.3426|INFO|8|Throttled restart of process by 239,180.92ms: PowerBI
2017-05-30 10:16:08.3426|INFO|8|Launching Process : PowerBI
2017-05-30 10:16:08.3426|INFO|8|Starting Process: C:\Program Files\Microsoft Power BI Report Server\PBIRS\PowerBI\RSPowerBI.exe
2017-05-30 10:16:09.1597|WARN|18|Child Process [PowerBI] Died. Check the log for further information

This was in the RSManagement log at the same time:

2017-05-30 10:16:08.7476|TRACE|7|Received request NT SERVICE\PowerBIReportServer GET http://localhost:8083/api/v1.0/ManagementState| RequestID = s_44f8a9e7-dd1d-41f8-b366-f547d6296e47
2017-05-30 10:16:08.7476|DEBUG|7|MeteredSqlConnection: Connect to Data Source=DEVDB1;Initial Catalog=RSPowerBI;Integrated Security=True;Application Name=RSManagement| RequestID = s_44f8a9e7-dd1d-41f8-b366-f547d6296e47
2017-05-30 10:16:08.7646|DEBUG|7|MeteredSqlConnection: Connect to Data Source=DEVDB1;Initial Catalog=RSPowerBI;Integrated Security=True;Application Name=RSManagement| RequestID = s_44f8a9e7-dd1d-41f8-b366-f547d6296e47
2017-05-30 10:16:08.7646|DEBUG|11|MeteredSqlConnection: Connect to Data Source=DEVDB1;Initial Catalog=RSPowerBI;Integrated Security=True;Application Name=RSManagement| RequestID = s_44f8a9e7-dd1d-41f8-b366-f547d6296e47
2017-05-30 10:16:08.7646|WARN|11|Changing Symmetric key| RequestID = s_44f8a9e7-dd1d-41f8-b366-f547d6296e47
2017-05-30 10:16:08.7646|TRACE|11|Sending response. Response code NT SERVICE\PowerBIReportServer 200| RequestID = s_44f8a9e7-dd1d-41f8-b366-f547d6296e47

More from the log:

2017-05-30 10:16:08.7856|INFO|1|Setting up Hosted Process State
2017-05-30 10:16:08.7856|INFO|1|CFG : rsConfigFilePath = [C:\Program Files\Microsoft Power BI Report Server\PBIRS\ReportServer\rsreportserver.config] (env)
2017-05-30 10:16:08.7856|INFO|1|Attempting to read Configuration from file C:\Program Files\Microsoft Power BI Report Server\PBIRS\ReportServer\rsreportserver.config -> C:\Program Files\Microsoft Power BI Report Server\PBIRS\ReportServer\rsreportserver.config
2017-05-30 10:16:09.0677|FATAL|1|Could not start PBIXSystem.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Net.HttpListenerException: Access is denied
   at System.Net.HttpListener.AddAllPrefixes()
   at System.Net.HttpListener.Start()
   at Microsoft.Owin.Host.HttpListener.OwinHttpListener.Start(HttpListener listener, Func`2 appFunc, IList`1 addresses, IDictionary`2 capabilities, Func`2 loggerFactory)
   at Microsoft.Owin.Host.HttpListener.OwinServerFactory.Create(Func`2 app, IDictionary`2 properties)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.Owin.Hosting.ServerFactory.ServerFactoryAdapter.Create(IAppBuilder builder)
   at Microsoft.Owin.Hosting.Engine.HostingEngine.Start(StartContext context)
   at Microsoft.PowerBI.ReportServer.WebHost.Program.Main()

While trying to upload from power BI desktop for SSRS I get the following error 

MartyGalvan

This seems to point to a URL registration issue. This could be caused by a couple scenarios:

1. Permissions

The PBI service account does not have permissions to write new HTTP reservations.

We can test this by changing the PowerBI sever account to be an admin account via the configuration manager and restarting the service

2. Conflicting reservation

Does the user have another instance of SSRS installed on this server? If so do the URLs configured conflict at all?

Please refer to this thread, you error message should be same as them.

Best Regards,
Herbert