GML Networking: Issues receiving packet

I am having some difficulty dealing with networking - sending and receiving packets.

Right now I am stuck with the following problem: whenever I call network_send_packet() the function returns a real positive number (indicating that it has worked correctly ), although, the server is not receiving any package.

I am really confused because I cannot identify a difference between the way I am creating the network and the way the game maker studio demo does that.

Here's the link to my project:

I am trying to debug the code like this:


Verifying that the packet has been sent, and then putting a break point in the server event, but it is not even stopping at that point

obj_server - async network

Does anyone know what is happening?
Thanks in advance