Opening ports in the firewall for the Mail Server

There are standard ports that are used to access most services. For example, accessing a website generally uses port 80 for normal (HTTP) web pages and port 443 for secure (HTTPS) pages. Smtp Smtp generally uses port 25 for connections although there are recommendations for port 587 (see the official documentation for details). Pop and [...]

Installing Shoreline firewall (Shorewall) in RHEL

Shorewall is the common name for the Shoreline firewall, a “wrapper” for IPTables that will handle all the heavy lifting for you by simplifying the tasks. This article will get you started, showing you how to get Shorewall on your system. Installation Now then, I have good news and bad news for you. The bad [...]

Configuring your Firewall for Webmin

Many operating systems block access to port 10000 by default (this is the default port for webmin interface), as they have a firewall activated as part of the installation process. This may prevent you from logging into http://yourserver:10000/ from another system on your network or over the Internet. The simplest way to open up port [...]