Google-chrome – Fiddler causes the Internet access to stop working

Fiddler changes your proxy settings on startup and reverts them back to what they were before you started when Fiddler is closed.

However, that doesn't really explain your problem, because when Fiddler is running it will use your old proxy server as an upstream proxy, and when you shut it down, it reverts the settings back to what they were before.

If you don't want to use Fiddler with IE, uncheck the "Act as system proxy" checkbox inside Tools / Fiddler Options; note that you'll need to manually configure your application or framework (e.g. .NET) to use 127.0.0.1:8888 as a proxy though.

Create a keystore containing the Fiddler certificate. Use this keystore as the truststore for the JVM along with the proxy settings.

Here's how to do that:

• Export Fiddler's root certificate

Tools -> Fiddler Options... -> HTTPS -> Export Root Certificate to Desktop

• Create a keystore with this certificate

Open command line as administrator (keytool doesn't work otherwise)

<JDK_Home>\bin\keytool.exe -import -file C:\Users\<Username>\Desktop\FiddlerRoot.cer -keystore FiddlerKeystore -alias Fiddler

Enter a password when prompted. This should create a file called FiddlerKeystore.

• Now start the JVM with Fiddler as the proxy and this keystore as the truststore. You'll need these vmargs:

-DproxySet=true

-DproxyHost=127.0.0.1

-DproxyPort=8888

-Djavax.net.ssl.trustStore=<path\to\FiddlerKeystore>

-Djavax.net.ssl.trustStorePassword=<Keystore Password>

Use these vmargs in your eclipse run configuration and you should be good to go.

I'm able to capture HTTPS requests made from the JVM without any issues with this setup.