Category: Security and Firewall

Verify that port is open

Run following command: (1)netstat -tulpn | less or (2)netstat -lntp | grep :21 (put any port) tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 23054/vsftpd (3)netstat -lnp | grep ‘0.0.0.0:80’(4)netstat -lnp | grep ‘exim’ tcp 0...

APF

What is APF (Advanced Policy Firewall)? APF FirewallAPF is a policy based iptables firewall system designed for ease of use and configuration. It employs a subset of features to satisfy the veteran Linux user...

change the ssh port

It is advisable to change your ssh port from defaul 22 to something higher to lower your chances of brute force attacks Below are the steps to change the ssh port. 1. Update /etc/ssh/sshd_config...

DDOS Attack

First aid for DDOS attack on port 80 We can use the following steps to recover our server from a DDOS attack on the port 80. To do this you must have logged into...

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