we haven't noticed anything like that.
I'd say that the problem is probably related to how the VMs are integrated into your Ethernet. It's unlikely that the fact you're working on VMs, and not physicals machines, is causing the problem per se. Make sure the VMs have the same status in your Network as a regular machine (can they be pinged, do they have free access to the network (no password required) etc).
Also, if possible, please send us an instance of test that exhibits this behavior and we'll check it out.
Hope to hear from you!
the Telerik team
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