server crashing when zoning
 

Hi! I run a 7.0 server with minilogin. When i log 2 or more characters from my computer and i try to have them zone at the same time my server is crashing (exemple: i 2box and run the server on the same computer and use a group portal spell, them my server crash). Am i doing something wrong, i mean is there a special way to load the game when i 2box? thanks :)