Autodiscovery.sendMessageToIndividual() crashes with nil ObjectException

[Stefan Pantke <seaside dot ki at mac dot com>]

Based on AutoDiscovery, I derived a new class called TAAutoDiscovery.

Most stuff performs quite well. Multicast are send, and I see other 
systems.
When I try to connect with a remote party, this call fails
        
        if nil <> App.GetAutoDiscovery() Then
		App.GetAutoDiscovery().sendMessageToIndividual( theTarget, aCmd, aMes 
) // this line crashes
        End if

Target, aCmd and aMes all have values - at least the debugger shows 
values.
 especially, aMess has a defined UTF-8 encoding.

Anyway, I always get the NilObjectException().

Ideas?

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