Cannot attach to default Edge with DevTools Protocol but Chrome can

Question

I was trying to use DevTools Protocol with Edge following this guide. I ran MicrosoftEdge.exe --remote-debugging-port=9222 (made sure no other instance of Chrome or Edge are opening) then navigate to localhost:9222/json using Firefox, however no connection was made.

I tried again with Chrome chrome.exe -remote-debugging-port=9222 then navigate to localhost:9222/json and it worked.

What went wrong in Edge?

Answer 1

Hi @Huy Nguyen ,

I have successfully reproduced this issue. What I've found out is, you might have some Edge processes remain, so that --remote-debugging-port=9222 is not recognized when you inspect at edge://version/. You can simply kill all the existing msedge.exe processes to resolve the problem. Please use the following command:
taskkill /f /im msedge.exe

After that, you should be able to enable the remote debugging feature.

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