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I had Myrtille running fine on Windows 10 before, but I can't install it on my Windows 11 machine. The installer gets interrupted with this error:

Failed to install Myrtille.Web (System.Exception: An error occured while running C:\Program Files (x86)\Myrtille\Myrtille.Web.Install.ps1. See C:\Program Files (x86)\Myrtille\log\Myrtille.Web.Install.log for more information.

The last lines of Myrtille.Web.Install.log say:

Created Myrtille self-signed certificate
Created https binding on default web site
You cannot call a method on a null-valued expression.

What's the problem here and how to fix this?

Thank you for your return with Myrtille under Windows 11. I still have to test Myrtille on it.

This looks like a problem with attaching the self-signed SSL certificate to the https binding:/ what you can do is uncheck the SSL certificate installation in the installer (and optionally create / attach an SSL certificate manually afterward, using the IIS management console).

You're right, that fixed it! I got it installed now, but nothing happens when I try to connect to an RDP host. Don't know if this could be Windows 11 related.

Is there something relevant into the logs?

Yes, Myrtille.Web.log throws some errors:

2022-02-21 14:43:21,492 [36] ERROR System.Diagnostics redirection [(null)] - Failed to retrieve the active remote session (System.NullReferenceException: Object reference not set to an instance of an object.
   at Myrtille.Web.SendInputs.Page_Load(Object sender, EventArgs e))
2022-02-21 14:43:57,265 [53] ERROR System.Diagnostics redirection [(null)] - Failed to retrieve service process identity, remote session 1d301cd0-d2c0-4d43-8db3-ec403280ea77 (System.ServiceModel.AddressAccessDeniedException: HTTP could not register URL http://+:80/Temporary_Listen_Addresses/6f75e9ce-83ca-47b1-9a67-20805b926421/. Your process does not have access rights to this namespace (see http://go.microsoft.com/fwlink/?LinkId=70353 for details). ---> System.Net.HttpListenerException: Access is denied
   at System.Net.HttpListener.AddAllPrefixes()
   at System.Net.HttpListener.Start()
   at System.ServiceModel.Channels.SharedHttpTransportManager.OnOpen()
   --- End of inner exception stack trace ---
   at System.ServiceModel.Channels.SharedHttpTransportManager.OnOpen()
   at System.ServiceModel.Channels.TransportManager.Open(TransportChannelListener channelListener)
   at System.ServiceModel.Channels.TransportManagerContainer.Open(SelectTransportManagersCallback selectTransportManagerCallback)
   at System.ServiceModel.Channels.TransportChannelListener.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.HttpChannelListener`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.LayeredChannelListener`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.DatagramChannelDemuxer`2.OnOuterListenerOpen(ChannelDemuxerFilter filter, IChannelListener listener, TimeSpan timeout)
   at System.ServiceModel.Channels.SingletonChannelListener`3.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.InternalDuplexChannelFactory.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ReliableChannelFactory`2.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelFactory.TypedServiceChannelFactory`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.ChannelFactory.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.ChannelFactory.EnsureOpened()
   at System.ServiceModel.DuplexChannelFactory`1.CreateChannel(InstanceContext callbackInstance, EndpointAddress address, Uri via)
   at System.ServiceModel.ClientBase`1.CreateChannel()
   at System.ServiceModel.ClientBase`1.CreateChannelInternal()
   at System.ServiceModel.ClientBase`1.get_Channel()
   at Myrtille.Web.RemoteSessionProcessClient.GetProcessIdentity())
2022-02-21 14:43:57,267 [53] ERROR System.Diagnostics redirection [(null)] - Failed to create pipes, remote session 1d301cd0-d2c0-4d43-8db3-ec403280ea77 (System.ServiceModel.AddressAccessDeniedException: HTTP could not register URL http://+:80/Temporary_Listen_Addresses/6f75e9ce-83ca-47b1-9a67-20805b926421/. Your process does not have access rights to this namespace (see http://go.microsoft.com/fwlink/?LinkId=70353 for details). ---> System.Net.HttpListenerException: Access is denied
   at System.Net.HttpListener.AddAllPrefixes()
   at System.Net.HttpListener.Start()
   at System.ServiceModel.Channels.SharedHttpTransportManager.OnOpen()
   --- End of inner exception stack trace ---
   at System.ServiceModel.Channels.SharedHttpTransportManager.OnOpen()
   at System.ServiceModel.Channels.TransportManager.Open(TransportChannelListener channelListener)
   at System.ServiceModel.Channels.TransportManagerContainer.Open(SelectTransportManagersCallback selectTransportManagerCallback)
   at System.ServiceModel.Channels.TransportChannelListener.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.HttpChannelListener`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.LayeredChannelListener`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.DatagramChannelDemuxer`2.OnOuterListenerOpen(ChannelDemuxerFilter filter, IChannelListener listener, TimeSpan timeout)
   at System.ServiceModel.Channels.SingletonChannelListener`3.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.InternalDuplexChannelFactory.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ReliableChannelFactory`2.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelFactory.TypedServiceChannelFactory`1.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.ChannelFactory.OnOpen(TimeSpan timeout)
   at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
   at System.ServiceModel.ChannelFactory.EnsureOpened()
   at System.ServiceModel.DuplexChannelFactory`1.CreateChannel(InstanceContext callbackInstance, EndpointAddress address, Uri via)
   at System.ServiceModel.ClientBase`1.CreateChannel()
   at System.ServiceModel.ClientBase`1.CreateChannelInternal()
   at System.ServiceModel.ClientBase`1.get_Channel()
   at Myrtille.Web.RemoteSessionProcessClient.GetProcessIdentity()
   at Myrtille.Web.RemoteSessionPipes.CreatePipes())
2022-02-21 14:43:57,274 [53] ERROR System.Diagnostics redirection [(null)] - Failed to call service start process, remote session 1d301cd0-d2c0-4d43-8db3-ec403280ea77 (System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.DuplexChannelFactory`1[Myrtille.Services.Contracts.IRemoteSessionProcess], cannot be used for communication because it is in the Faulted state.
   at System.ServiceModel.Channels.CommunicationObject.ThrowIfDisposed()
   at System.ServiceModel.ChannelFactory.EnsureOpened()
   at System.ServiceModel.DuplexChannelFactory`1.CreateChannel(InstanceContext callbackInstance, EndpointAddress address, Uri via)
   at System.ServiceModel.ClientBase`1.CreateChannel()
   at System.ServiceModel.ClientBase`1.CreateChannelInternal()
   at System.ServiceModel.ClientBase`1.get_Channel()
   at Myrtille.Web.RemoteSessionProcessClient.StartProcess(Guid remoteSessionId, HostType hostType, SecurityProtocol securityProtocol, String serverAddress, String vmGuid, String userDomain, String userName, String startProgram, Int32 clientWidth, Int32 clientHeight, Boolean allowRemoteClipboard, Boolean allowPrintDownload, Boolean allowAudioPlayback))
2022-02-21 14:43:57,276 [53] ERROR System.Diagnostics redirection [(null)] - Failed to connect the remote session 1d301cd0-d2c0-4d43-8db3-ec403280ea77 (System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.DuplexChannelFactory`1[Myrtille.Services.Contracts.IRemoteSessionProcess], cannot be used for communication because it is in the Faulted state.
   at System.ServiceModel.Channels.CommunicationObject.ThrowIfDisposed()
   at System.ServiceModel.ChannelFactory.EnsureOpened()
   at System.ServiceModel.DuplexChannelFactory`1.CreateChannel(InstanceContext callbackInstance, EndpointAddress address, Uri via)
   at System.ServiceModel.ClientBase`1.CreateChannel()
   at System.ServiceModel.ClientBase`1.CreateChannelInternal()
   at System.ServiceModel.ClientBase`1.get_Channel()
   at Myrtille.Web.RemoteSessionProcessClient.StartProcess(Guid remoteSessionId, HostType hostType, SecurityProtocol securityProtocol, String serverAddress, String vmGuid, String userDomain, String userName, String startProgram, Int32 clientWidth, Int32 clientHeight, Boolean allowRemoteClipboard, Boolean allowPrintDownload, Boolean allowAudioPlayback)
   at Myrtille.Web.RemoteSessionSocketHandler.OnOpen())