AHOORAking

Hi I recently saw the software and install it. At first glance, the software is great. I have a game net an 8 systems whit Lan Conecting..all games works whit lan but in this Game MTA i cant find server. i create the server in one of systems but in another system i cant find the servere as a clinet. it just says cant find/conection time out fire wall is off and allowed the MTA SERVERE in Control panel/security. My Windowsis : 7 i intered the server ip [172.20.1.8] in adress bar and....nothing systems not conected to internet and just Lan Play pls help me.. sory for bad english .