Network

I am using Fail2Ban for around 12 years now, maybe more. It started back when ssh brute-forcing script kiddies were everywhere. Who are they? They are people or machines scanning all IPs on the internet, and if they find an open SSH port, they start doing brute force password attacks. They do this for MySQL, PostgreSQL, or basically any open port. If there is a possibility of username/password login, someone will try to get in. ...

Today I needed to check which ports are open on a remote server to ensure that the services I need are running and accessible. Here are a few ways to check which ports are open on a remote server: Telnet Telnet is a command-line tool that can be used to check if a port is open on a remote server. You can use the following command to check if a port is open: ...