Fiddler not capturing traffic. Proxy settings keep getting changed

Question

A few days ago, a yellow banner started to appear in Fiddler reporting that my proxy settings had changed and that if I clicked the yellow banner, I could re-enable Fiddler traffic capture.

Upon clicking, the banner and the error message wouldn't go, and Fiddler had stopped capturing all traffic.

I searched the Web and found how to change the proxy settings back to 127.0.0.1 and port 8888.

However, when I do that, something keeps setting the port number back to 63758.

The version of Fiddler I am using is v2.4.9.9 on a Windows 7 Home Premium PC.

Please see picture attached. What should I do?

Answer 1

1. This probably belongs on Superuser rather than StackOverflow.
2. You don't need to "search the web" to change your proxy settings, just click the big yellow bar.
3. You'll need to find what is changing your proxy settings. My guess is that you're infected with Adware like BrowserSafeguard or GeniusBox. You can either use netstat -a -o to find the process listening on the port in question, or you can use SysInternals' Process Monitor to watch the Proxy Server registry key and see who is changing it.