Networking monitoring can be an eye opener in regards to network connections of programs that run on a computer system.
I started to monitor network connections closely recently and decided to take a closer look at some popular programs installed on a Windows test machine to check if they'd phone home automatically.
I set up Fiddler and started to monitor the program's output while launching and using programs such as Bandizip, Steam or Firefox.
Some network connections are required obviously. When I enter an address in the Firefox address bar for instance, I want that connection to be made.
But there are connections that are not initiated by the user. Some may still be necessary or wanted by the user, a check for updates for instance. If you monitor the connections closely however, you may notice some that you don't consider essential or required at all.
If you take the popular archive program Bandizip for instance. It checks for updates by default but also connects to analytics.bandisoft.com on first start as well.
While you can disable the update check in the program options, you cannot disable the ping to Analytics and the setting of a cookie on the system.
Dealing with unwanted connections
Once you have identified an unwanted connection on your system, you need to find a way to deal with it. You may have several options at your disposal, for instance by creating a new rule in a software or hardware firewall to block the domain.
One of the easier options is to use the Hosts file that every version of Windows ships with. Let me walk you through the steps of blocking the Bandizip Analytics domain from connecting to your system.
This blocks connections to analytics.bandisoft.com by mapping it to the address 0.0.0.0 instead of its original IP address.
Why 0.0.0.0 and not 127.0.0.1? Because it is faster.
It takes time to monitor and identify unwanted connections on a system. A firewall may help with that if it is configured to prompt whenever a new connection is established for the first time.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.