VOS3000 Hacking prevention and protection

VOS3000 old versions are being hacked . its costing too much money through illegal calls .you can prevent it some level  by taking some precaution .
1-  Make your server SSH root password complicated
2- Make your server mysql password complicated
3- Make your vos3000 client Admin password complicated
4- Make your vos3000 client user access password complicated.
5- Make your buyers and seller IP authenticated
6- make your firewall on
contact for more vos3000 security and firewall ,anti hack