Guides from the NOC

Install RabbitMQ on an Ubuntu VPS, lock down the default guest account, open it safely for remote workers, and fix the connection errors that trip people up.

UFW commands don't work on AlmaLinux. Learn firewalld zones, firewall-cmd basics, and how to secure a fresh AlmaLinux or CentOS VPS without locking yourself...

Published Docker container ports staying open even after UFW denies them? Learn why Docker bypasses UFW via iptables, and how to actually lock it down.

Set up ConfigServer Security & Firewall (CSF) in WHM the right way: correct ports, testing mode, LFD alerts, and how to recover if you lock yourself out.

Learn how to set up UFW on your VPS, allow only the ports you need, and stop random port scans from finding an open door into your server.

Nothing answered at all. Silence means a packet was dropped rather than rejected, and that narrows the search to the firewall layers between you and the port.

The server answered, and the answer was no. That is a much more specific failure than a timeout, and it points at four causes rather than twenty.

Cut spam and brute-force logins by blocking traffic from specific countries using CSF's CC_DENY on a VPS or Cloudflare firewall rules - step by step.

Fix Windows VPS RDP connection errors and stop brute-force login attempts with port changes, NLA, firewall rules, and strict account lockout policies.

WHM showing a cPanel license verification error? Here's why it happens after IP changes, firewall blocks, or clock drift, and how to fix it fast.

Wordfence, Sucuri, or iThemes blocking your own login? Regain access via File Manager or SFTP, fix the firewall rule, and whitelist your IP for good.

Run cloudflared on your VPS to expose n8n, Grafana, or admin dashboards through Cloudflare Tunnel — no open inbound ports, no cert to manage.

Cloudflare Turnstile widget missing or failing verification in WordPress? Fix domain, key, caching, and firewall issues causing it to break.

Set up vsftpd on a bare VPS with TLS encryption and a proper chroot jail, and fix the passive-mode firewall issue that breaks most FTP setups.

VPS throwing "Temporary failure in name resolution"? Fix broken resolv.conf, systemd-resolved, and firewall issues stopping DNS lookups on Linux.

Install k3s on a single VPS the right way: firewall rules, kubectl access from your laptop, ingress with TLS, and fixes for the errors that block startup.

wp-login.php getting hammered by bots? Set up a custom Fail2Ban jail on your VPS to block WordPress login brute-force attacks right at the firewall level.

Set up a self-hosted WireGuard VPN on your VPS: install, keys, wg0.conf, firewall rules, client config, and fixes for handshake and routing problems.

New VPS setup checklist: SSH keys, sudo user, UFW firewall, swap, fail2ban and a snapshot baseline - all in the critical first hour after deployment.