Unable to Start Debugging. visual studio 2012 prompt after one time debug

Question

I am getting this error \"Unable to Start Debugging\" in visual studio 2012.

I have also update the remote debugging sp2.

also uninstalled and r

Answer 1

Right Click web application properties -> Properties Windows, Use dynamic ports to "False" and give some port number. This solved my problem.

Answer 2

There doesn't seem to be an actual question to answer, but maybe this will help somebody. I have the same problem with VS2012 on Windows 8.1, even with Update 4 of Visual Studio and Remote Tools. I can get around it by manually closing IIS Express with the task bar icon between debugs. It is still really annoying, but at least it works, at least most of the time. One time it didn't seem to help and I had to reboot, but after that it was working again.

Answer 3

Save your work, close Visual Studio then reopen your project

Answer 4

I had the same problem in my Visual Studio 2013. The solution I found is easy.

Just right-click the project you want to debug, and choose "Set as StartUp Project".

Hope I helped someone.

Answer 5

Juste got the same today with VS2010. "Unable to start debugging...a dynamic DLL cannot be found". Also while opening this old project an non-build error in the outpout window: "Unable to find assembly <...>.dll in App_Data\Temp".

Solution: target framework was still at version 3, changed to 4 and then it works.

Answer 6

I've had the same problem this morning. Installing Visual Studio 2013 wasn't an option for me (And I very much doubt it would be for lots of people). Rebooting has usually solved the problem before, (and a bit less drastic),

Manually attaching the process (TOOLS -> Attach to process (ctrl + ALT +p)) to w3wp.exe for IIS, or IIsExpress.exe also worked, which leads me to suspect that VS is having trouble figuring out which process it should attach to automatically.