the script debugger failed to connect to the target process. Adebugger is already attached

javascript visual-studio-2010 ie-developer-tools
StackTrace picture StackTrace · Nov 25, 2014 · Viewed 20.2k times · Source

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Windonws 7 64-bit and VS2010

In F12 developer tools for IE11 on Windonws 7 64-bit and VS2010, when I click the Debugger tool icon or press Ctrl + 3 to open the tool, I'm not able to debug my java-script files.

When I click the Debugger tool icon, i'm presented with the message in the screenshot above & I can't see the javacsript files my current page calls, so I'm unable to debug my javascript code.

Any one knows why I could be getting this message? I have tried everything mentioned at the following link with out success. VS2010 and IE10 Attaching the Script debugger to process iexplore.exe failed

Answer

RB2 picture RB2 · Jan 20, 2015

I was encountering this problem with VS 2012 & Win 7 and also VS2013 and Win8.1:

Perplexed for half a day, looking up things online, finally figured it out myself.

Learn the difference between these in Visual Studio: F5 vs (Ctr+Shift+W)

F5 will engage VS debugger and you will get the:

"The script debugger failed to connect to the target process. A debugger is already attached"

when using the F12 Developer Tool in I.E. 11 or whatever version.

However, if you use the V.S. command: View in Browser(Ctrl+Shift+W) this will run the script and allow I.E's script debugger(F12 Dev Tool) to engage and work.

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