since ur using ur global IP address in server files..
all u need to do is to go to C:\WINDOWS\system32\drivers\etc\Hosts (HOST PC)
open Hosts File
and below, add a new line(check the red lines)
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
192.168.xx.xx 121.xxx.xxx.xx
192.168.xxx.xxx(localIP) 121.xxx.xxx.xxx(or something like that Global IP)
then after that go to your Other PC and do the same
go to C:\WINDOWS\system32\drivers\etc\Hosts
add a new line below but this time go to start>run>cmd>ipconfig
of course, since its a diffecrent computer, it has a different lan ip.
then do the same above
i hope it will work

ott1: