WCF - The message could not be dispatched because the service at the endpoint address ... is unavailable for the protocol of the address

Question

1. Open a command prompt
2. Navigate to c:\windows\microsoft.net\framework64\v4.0.30319
3. Register the service model using the command "ServiceModelReg.exe -r"

Credits go there http://kumaranbose.blogspot.be/2010/08/cryptic-wcf-nettcp-errors.html

This issue hunts me for almost 3 years now but only happens sporadically. TCPView helped. I have killed SMSSvcHost.exe process and then restarted Net.Tcp Listener Adapter service. That cleared the issue. Not really a solution but at least, I don't have to resort to rebooting the server anymore.

I had this issue. It would happen after each IIS reset (which happens as part of our deployment). The issue was resolved after restarting NetTcpPortSharing service (which also restarts Net.Tcp Listener Adapter service)

I am not sure I have an answer but, you could identify the process that has the port open and that can help narrow the scope of the problem. I have used Sysinternals suite which has a TCPView. This proggy was helpful to me.

TCPView - http://technet.microsoft.com/en-us/sysinternals/bb897437