Estou usando o violinista, mas quando o fecho perco minha conexão com a internet.
Fiddler
às vezes não restaura as configurações de proxy da Internet quando está fechado (permanece configurado para seu próprio proxy, que não está mais em execução).
Isso significa que o tráfego HTTP será enviado para um proxy que não existe.
"O servidor proxy não está respondendo" Problema Causado pelo Fiddler
Very occasionaly I ran into the problem of losing network connection after using Fiddler for debugging with web traffic. To be more precise, this problem usually happens after closing the Fiddler application.
...
After this problem happens, and when I open IE, I see the error message of "The proxy server isn't responding".
Fiddler sometimes fails to unregister itself as the system proxy upon on quitting. In that case you will be redirecting all your HTTP traffic to a proxy that doesn't exist, and thus gives you the error shown above.
The easy way to fix this, is to relaunch the Fiddler application which will act as system proxy again (make sure you set the option in "Fiddler Options" - "WinINET Connetions").
Close the application gracefully and it should fix the connection path for you.
Or, you could manually clear the proxy settings by going to:
Internet -> Options
->LAN setting
->Connections
Uncheck the option of
Use a proxy server for your LAN
. (You should see a proxy like 127.0.0.1:8888, which is the default listening port for Fiddler.)
Fonte Corrigir" O servidor proxy não está respondendo "Problema causado pelo Fiddler