SETUP FOR MULTI SERVERS - now without steam
remove the -server from the command line or batch file you have - you do not need this now.
make a copy of arma3server (ie arma3server1.exe, arma3server2.exe......)
one server:
my batch file (although you can use the command line.
start arma3server1.exe -nosplash -steamPort=8766 -steamQueryport=21016 -port=2300 -maxMem=2047 -noPause -cpuCount=3 -config=server.cfg
my other server:
start arma3server2.exe -nosplash -steamPort=8767 -steamQueryport=210176 -port=2310 -maxMem=2047 -noPause -cpuCount=3 -config=server1.cfg
Make sure arma3 isn't running to start, also make sure steam is shutdown.
If running of a server box open firewall for the arma3server.exe's