Regardless of the adapter type you choose, services in AX 2012 run as IL code - even if you are using the file adapter. To debug IL codeyou must use Visual Studio.
The steps for debugging a service are:
Thanks for this post.
But I wonder :
you need to be on the AOS.
Normally developer does not work in AOS directly, is there any workaround to debug IL from client VS?
You could try remote debugging in VS but yes otherwise you will need to be on the AOS.