Focused guides about networking, security, Windows and self-hosted systems. Each topic moves from understanding the problem to a tool you can use immediately.
Written around real deployments and problems solved across the N3X ecosystem.
Check the hostname, issuer, trust chain and service protocol — not just the expiry date. HTTPS and mail TLS require different tests.
Related tool: Check a certificate with N3X
Read guideEach mechanism protects a different part of mail delivery. Learn how to validate them together and avoid common DNS mistakes.
Related tool: Run an email security audit
Read guideA single listing is not always a disaster. Identify the sending IP, understand the list policy and fix the underlying cause first.
Related tool: Check 25 DNSBLs
Read guideA /24 is only the beginning. Calculate network, broadcast and host ranges for smaller subnets used by VLANs, VPNs and firewalls.
Related tool: Calculate a subnet with N3X
Read guideNot every device answers ping. Combine ARP, DNS and limited port probes, then treat the scan as the beginning of an inventory.
Related tool: Download N3XScan
Read guideAnalyse and back up first, then clean. Use supported Microsoft repair tools and preserve the full outcome of every operation.
Related tool: Download N3XCare
Read guideA web panel on port 443 is not the whole platform. Reliable remote support needs signaling, TURN, agent control and explicit access policy.
Related tool: Configure N3XRemote Server
Read guideReach a private Docker dashboard without exposing it to the Internet. Understand -L, -R and -D and choose safe bind addresses.
Related tool: Manage tunnels in N3XShell
Read guide