Web application security measures : Firewalls A firewall is a piece of software (or hardware) that controls what services are exposed to the network. This means blocking or restricting access to every port except for those that should be publicly available. On a typical server, a number services may be running by default. These can be categorized into the following groups: Public services that can be accesses by anyone on the internet, often anonymously. A good example of this is a web server that might allow access to your site. Private services that should only be accessed by a select group of authorized accounts or from certain locations. An example of this may be a database control panel. Internal services that should be accessible only from within the server itself, without exposing the service to the outside world. For example, this may be a database that only accepts local connections. Firewalls can ensure that access to your software is restricted accord...
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