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Tutorial Using nmap to check if a port is open on your server

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Apr 27, 2015
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Using nmap to check if a port is open on your server - How to use nmap to see if a port is open on your server.

Overview
Maybe your local email client isn't able to connect to the server, causing frustrating errors for your users. Or maybe you have just completed the cPanel installation but can't login to a new account. You know the services are working properly as they are listed as "up" in the Service Status area of WHM. But you still can't connect!

When these types of situations happen it's a good idea to check...
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