Remote debugging visual studio asp.net web application with external IP

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ASP.NET

debugging

Hi,
I try to install remote debugger in my remote machine, and connect to it in my local computer, using visual studio 2012 for asp.net web application, windows8.
remote and local computers are not in the same network.
I installed the visual studio remote debugger in the remote machine and run it. it's instance name is:"SERVER-PC:4016"
In the local machine, I work on the project by ftp and in debug-attach to processor in qualifier field I enter the name in this format: external_ip:4016, and get an error:"The Microsoft Visual Studio Remote Debugging Monitor (MSVSMON.EXE) does not appear to be running on the remote computer.."

p.s. I installed a local user in remote and local machine with the same name and password and run the relevant programs from this user name.

any ideas to solve my problem?
thank you!