Focused guides about networking, security, monitoring, infrastructure, 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.
21 guides
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 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 N3X Scan
Read guideAnalyse and back up first, then clean. Use supported Microsoft repair tools and preserve the full outcome of every operation.
Related tool: Download N3X Care
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 N3X Remote 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 N3X Shell
Read guideEditing a record is only the first step. Verify delegation, authoritative answers, TTL and multiple resolvers before changing DNS again.
Related tool: Check DNS propagation
Read guideAn open port is not automatically a vulnerability. Risk depends on the service, version, authentication, network restrictions and a real need for public access.
Related tool: Check TCP ports
Read guideWebsite security does not end with a certificate. Combine TLS, DNS, headers, email and network exposure into one prioritised assessment.
Related tool: Run a domain audit
Read guideA 200 status alone is not enough. Good monitoring separates DNS, connection, TLS and application response and also confirms recovery.
Related tool: Check response time
Read guideMegapixels alone cannot size a disk. Capacity depends mainly on actual bitrate, recording hours, retention and the number of streams.
Related tool: Calculate CCTV storage
Read guideDo not choose RAID by capacity alone. Failure combinations, rebuild time, write workload and restore capability all matter.
Related tool: Compare RAID levels
Read guideA container is not a security boundary. Reduce ports, privileges, secrets and networks, and publish only a controlled entry point.
Related tool: Explore N3X Docker apps
Read guideThe orange cloud does not protect services outside the proxy. Use Full (strict), trusted client-IP headers and block direct origin access.
Related tool: Check TLS
Read guideA backup exists only when you can restore it. Combine a daily logical dump, an off-host copy and recurring recovery drills.
Related tool: N3X application requirements
Read guideHardening starts before the container: constrain accounts and ports, configure patching, logs and an independent recovery channel.
Related tool: Check VPS exposure
Read guideIPv4 NAT may hide a service while public IPv6 reaches it directly. Audit DNS, listening sockets and firewall policy for both families.
Related tool: Scan IPv4 or IPv6
Read guideDeliverability is a chain. Separate connection failure, SMTP rejection, queue delay and spam-folder placement before changing configuration.
Related tool: Check email security
Read guideA green container does not prove that users can reach a working service. Combine external checks, host metrics, logs and backup recovery tests.
Related tool: Build a domain profile
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