Guides tagged “ports”
Step-by-step MdmHost guides about ports, sorted A-Z.
12 guides
Check which ports are open and listening on Linux
Use ss and lsof to list every listening port on your VPS, find the process behind each one, tell localhost from public bindings and close what you do not need.
Close unused ports and disable unneeded services on Linux
Fewer running services means fewer things to patch and attack. List what listens on your VPS, disable what you do not use, bind private services to localhost and firewall the rest.
Common server ports and what uses them
A practical list of the ports you meet on a VPS, from SSH and web to mail, databases and Remote Desktop, with the protocol and whether each should be public or private.
Configure firewalld on AlmaLinux and Rocky Linux
Learn the firewalld basics on AlmaLinux and Rocky Linux: zones, opening services and ports, permanent versus runtime rules, and IP-restricted access.
Docker Compose file explained: services, volumes, networks and ports
A line-by-line walk through docker-compose.yml: what services, volumes, networks, ports and depends_on do, with a working example stack you can run on a Linux VPS.
Docker run flags you will actually use (-d, -p, -v, -e, --restart)
The docker run options that matter on a VPS, explained with examples. Covers detached mode, port publishing, volumes, environment variables, names, restart policies and resource limits.
Imunify360 firewall settings: ports, country blocking and DoS protection (root guide)
Configure the Imunify360 firewall as root: open and close TCP/UDP ports, block countries, enable DoS protection, and avoid locking out cPanel, mail or SSH.
Open and close ports in CSF (TCP_IN, TCP_OUT, UDP_IN, UDP_OUT)
Edit the CSF port lists to open a port for a new service, close ports you do not use, and restrict a port such as SSH to trusted IPs on a cPanel/WHM server.
Ports, protocols and TCP vs UDP explained
How ports and protocols let one server run many services, the real difference between TCP and UDP, and which one common services use.
Set up a UFW firewall on Ubuntu and Debian
Set safe defaults, allow SSH before switching UFW on, open only the ports you use, limit sensitive ports to your own IP, and tidy up old rules.
TCP vs UDP explained for server owners
TCP sets up a connection and guarantees delivery; UDP sends independent datagrams with no handshake. Learn the difference, which services use each and why firewall rules must name the protocol.
Which firewall ports a cPanel/WHM hosting server needs
A complete list of the ports cPanel, WHM, webmail, email, FTP, SSH and DNS use, which ones to open in your firewall, and which you can safely close.
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