CSF is very helpful to allow or deny certain IP address with port in your Linux server. Based on your require block or allowing IP address with Port.

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You don't desire to send email alert for specific user from the server, we can ignore that alert

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We have already discussed about installing the ConfigServer firewall (CSF) in linux. The post you will be using most common commands and changes in the configuration file.

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CSF (ConfigServer Security & Firewall) is an important tool for secured and managing your server and generally more advanced firewall options..

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