Centos 7 replaced the traditional IPTables Linux Kernel Firewall with the Firewalld service. There are still a lot of scripts available that require the use of IPTables. A common example is the software Fail2ban. In this guide, I will explain
Which ports are used on a ISPConfig 3 server and shall be open in the firewall?
Here is a list of ports that are used commonly on ISPConfig 3 servers. If you don't have all services installed or if you e.g. don't want to connect to MySQL from external servers, then close the unused or unwanted
Block a program’s internet access with Windows 8 firewall
If you have some peculiar program installed that you need to have but want all its internet communication blocked you can do that easily with Windows' built in firewall. On Windows 8 just hit the Windows key to get to
Use separate configurations by network in the Windows 7 firewall
The Windows 7 Firewall allows separate configurations by network. This feature makes it possible to configure different firewall rules for the home network , the networkwork or a public network and Windows will apply these rules automatically when the computer
How to set the PassivePortRange in pure-ftpd on Debian and Ubuntu Linux
If you run a firewall on your Linux server and want to use passive FTP connections, you have to define the passive port range in pure-ftpd and your firewall to ensure that the connections dont get blocked. The following example