Thanks for the thorough information!
If you see the Echo Service page on the device, that means there's no problem with network connectivity between the device and the Fiddler PC.
When you see the Echo Service page on the device, do you see a corresponding entry in Fiddler's Web Sessions list?
If you click Help > Troubleshoot and then browse with the device, do you see entries in Fiddler's Web Sessions list that are marked in a strike-through font?
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items