As the title states: I was unable to attach the remote debugger (for instance to an Azure Web App) after installing Visual Studio 2015 Update 2. I got an error with something about invalid memory access or something like that.
The solution is simple: install Remote Tools for Visual Studio 2015 Update 2. Go to the webite, pick your machine’s architecture (the x86 install won’t run on a x64 machine) and click download. After installing, you’re good to go!
Hope this helps.
PS: There’s a list of Related releases on the Visual Studio 2015 Update 2 page. Have a look, it’s helpful ;)