Silverlight: NotFound on any network request

Question

Microsoft Silverlight

Hello!

Background:
Silverlight 4, 5
Out Of Browser Application
Windows 8 x64
Firewalls Disabled

I have the following problem: on my machine, any Silverlight application on any network access (WebClient, WCF, etc.) very quickly returns a WebException "Remote server returned error: Not Found". There is no more specific information in the exception.
It does not depend on the server - I just try to download HTML at any address - I get an error. Specifically, access to a remote service via WCF is of interest, but any calls over the network do not work, even on localhost.
This situation occurs completely unexpectedly - a minute ago everything worked, the next time it starts, everything no longer works. It does not depend on the application - I create new test ones - the same story. A test project created and running on another machine throws the same error on my machine.
Moreover, the application running in VirtualBox on my own machine feels great.
Faced with this for the third time in a short time. The first time I had to reinstall the system, the second time - by restoring the system (standard) a couple of days ago.
Neither rebooting the computer, nor deleting/disabling network interfaces, nor reinstalling Silverlight Runtime solves the problem.

Has anyone experienced similar behavior?

The solution is found, I'm looking for an answer to "why" and "what are the workarounds."

Playback method (it works for me):
- Run the SL application
- Disable the network connection (for example, netsh interface set interface name = "Local Area Connection 2" admin = DISABLED)
- From SL we access the network - we get a legitimate NotFound
- Turn on the network connection
- SL still can't see the network.

What's wrong:
- HKU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\GlobalUserOffline changes from 0x00000000 to 0x00000001.
Those. IE goes into Offline mode. And since SL is based on IE, so is it.
The trouble is that the SL no longer switches on its own in the opposite direction.
To bring it back to life, you need to either manually change 1 to 0, or ... just start IE.
Very similar to a Microsoft bug.

Answer 1

fiddler2 what shows for the exchange?