If you've recently added a new firewall and aren't sure if it's running properly — or just want to run a spot check on your existing firewall — here's how to make sure your firewall is working.

Test your firewall. One of the most fundamental security setups is a firewall. Windows and Mac have decent firewall built in, and many third-party security programs include them.

Read: Ways to test your firewall software, for free, and find out how well it is protecting your computer. How do I stop a process from running?

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