"The RDP header is missing or not valid" error messages in the logs

Question

I have a simple MVC3 Web Role deployed to Azure.
I noticed that every minute I get this set of three error messages in the WADDiagnosticInfrastructureLogsTable:

Cannot read data from the remote connection. Closing session...
The RDP header is missing or not valid.
Cannot locate remote endpoint. Closing remote socket...

I am not connected through Remote Desktop or anything like that.

Any ideas where this could be coming from?

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Aleksey

Answer 1

In your service definition do you see imports for RDP something like this

<Imports>

      <Import moduleName="RemoteAccess" />

      <Import moduleName="RemoteForwarder" />

    </Imports>

Also check what are the values in service configuration for RDP related setting. Just a wild guess,  remote forwarder is enabled and not able to remoteaccess to the instances.

Answer 2

Yes, I do have those modules, and remote desktop works fine.
What puzzles me is that I see those errors all the time, no matter if I use remote desktop or not.

It does have something to do with the forwarder, though I currently have only one instance - nothing to forward here.

I caught another error message in the log table:

System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'System.Net.Sockets.NetworkStream'.
   at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   at Microsoft.WindowsAzure.Plugins.RemoteForwarder.AsynchronousStreamConnector.<>c__DisplayClass2.<ConnectStreams>b__0(IAsyncResult readResult)

This is definitely not coming from my code...

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Aleksey

Answer 3

Not sure but i think it should not impact your app anyways as those are WADDiagnosticInfrastructureLogsTable. Let us wait for somebody from Microsoft to comment on this.

-Sachin

Answer 4

If you just wanna fix the problem and get the messages out of the diagnostic table, I think you can consider restarting remoteforwarderagent.exe and remoteaccessagent.exe.

If you are interested in finding out if there are remote connection attampts and where they come from, a network sniffer like network monitor should give you some idea--setup that on the VM and let it run for a while, then analyze the captured network traffic to see if there are rdp related packages there.

-Emma