AFAIR the workaround was to do your own ARP request first in order
to check whether the destination exists or not, utilizing the IP Helper API.

Yes, that what I did.

How can I confirm that this is what's happening with me?

In my case, the blocking was occuring in the main thread. TO see it it was then easy: using the mouse, I moved continuously the form in small circles. When blocked, the application don't paint the form and the window was stuck. Then using WireShark I was able to see that the blocking was when ARP requests were sent to non existant address.

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francois.pie...@overbyte.be
The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be

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