Instantiating a System.Runtime.Remoting.Channels.Ipc.IpcChannel was throwing a System.NotSupportedException. In Visual Studio, hovering over the exception showed it to be a plain System.Exception containing a property _COMPlusExceptionCode with a value of -532462766. I've also seen a RemotingException, "Failed to create an IPC Port: Access is denied", so the error message you receive may be inconsistent as well.
The problem appears to be a lingering, identical IpcChannel within the same process, even one that is no longer registered but has not yet been completely cleaned up. The _COMPlusExceptionCode threw me off for a while, but it appears a solution has been found here:
http://social.msdn.microsoft.com/Forums/en/netfxremoting/thread/d154e4a9-3e31-41a5-944c-db867ca77e9e
However this solution will permit multiple connections to be open with potentially undesirable consequences. A loop that makes several attempts to create the IpcChannel may be a more appropriate solution.
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