Know the configuration sequence or routine. Most Windows NT based firewalls are easier to set up than UNIX firewalls. Problems Firewalls can not solve Any host or network connected to the Internet can not be made completely secure. Firewalls will keep most unauthorized users from your private data. There are so many different ways to exploit connections that no method is entirely secure.
Many users mistakenly assume that once the firewall is online, that the security problem is gone.
This is not the case at all. Forged e-mail addresses can not be stopped. The operating system and the firewall can only respond this type of hack. The firewall can not tell if the Reply To is forged if it is from a previously valid e-mail address. Modems provide a hidden threat to the host or network through hidden border crossing by going around the firewall.