--- title: #networking description: 31 articles about networking — guides and explainers from the WatchFor team. canonical: https://watchfor.io/blog/tag/networking --- [All posts](/blog) # #networking Articles tagged "networking". [All](/blog)[Monitoring](/blog/category/monitoring)[Networking](/blog/category/networking)[Performance](/blog/category/performance)[Security](/blog/category/security)[Reliability](/blog/category/reliability)[Email](/blog/category/email)[DevOps](/blog/category/devops)[Engineering](/blog/category/engineering) [All articles](/blog/all) 31 article s · page 1 of 2 [EngineeringSep 10, 2026 ## Your CDN didn't go down. It stopped caching — and nothing told you. Every other outage announces itself. A CDN that stops caching does the opposite: the site stays up, every status code stays 200, and your uptime dashboard stays green while every single request travels to your origin. Here's why that happens, why one request from one machine can never detect it, and what we built to catch it — including the claims we refused to make.WatchFor Team10 min read](/blog/why-your-cdn-stopped-caching)[SecuritySep 01, 2026 ## Why we built our own SSL/TLS grade checker For over a decade, one free tool defined what a 'good' HTTPS setup looks like: the Qualys SSL Labs Server Test and its A+ to F grade. It's brilliant — and showing its age. Here's the short history of the SSL grade, what SSL Labs gets right, where it falls short in 2026, and why we built a faster, more modern grader of our own — including the post-quantum check SSL Labs doesn't have yet.WatchFor Team5 min read](/blog/ssl-grade-checker)[NetworkingAug 23, 2026 ## DNS propagation is a myth: what's actually happening when your record 'takes 48 hours' Nothing propagates. DNS changes don't spread across the internet — caches expire, one resolver at a time, on a timer you set yourself. Once you see it that way, migrations stop being scary: here's the TTL playbook, the myths that refuse to die, and the checks that tell you the truth.WatchFor Team4 min read](/blog/dns-propagation-myths)[NetworkingJun 26, 2026 ## Advanced SSH: jump hosts, tunnels, and power-user tricks Once you know basic SSH, a whole toolbox opens up: jump hosts to reach private servers, port forwarding, SOCKS proxies, agent forwarding, and a config file that makes it all effortless. The power-user guide.WatchFor Team5 min read](/blog/advanced-ssh-tunnels-jump-hosts)[NetworkingJun 26, 2026 ## FTP vs FTPS vs SFTP: file transfer protocols explained FTP, FTPS, and SFTP all move files — but only two are safe, and they work in completely different ways. Here's how each protocol works, active vs passive mode, the best clients per OS, and which to use.WatchFor Team6 min read](/blog/ftp-ftps-sftp-explained)[NetworkingJun 26, 2026 ## SSH explained: secure remote access, keys, and sessions SSH is how you securely log into and control machines anywhere in the world. Here's what it is, how password vs public-key auth really works, how to run remote commands, and the best clients for every OS.WatchFor Team5 min read](/blog/ssh-explained)[NetworkingJun 12, 2026 ## How DNS Works (and What 'Propagation' Really Means) DNS is the internet's phonebook — and one of the most common causes of outages nobody understands. Here's how a domain name becomes an IP address, in plain English, plus what 'propagation' actually is.WatchFor Team4 min read](/blog/how-dns-works)[NetworkingMay 09, 2026 ## DNS Record Types Explained: A, AAAA, CNAME, MX, TXT and more Setting up a domain means meeting a zoo of record types — A, AAAA, CNAME, MX, TXT, NS. Here's what each one does, when to use it, and the gotchas that trip people up.WatchFor Team4 min read](/blog/dns-record-types-explained)[SecurityMay 06, 2026 ## How HTTPS Works: the TLS handshake, explained simply That little padlock does a lot of work. Here's what actually happens when you connect over HTTPS — the TLS handshake, certificates and encryption — without the cryptography headache.WatchFor Team3 min read](/blog/how-https-works)[NetworkingMay 02, 2026 ## Ping, Traceroute & MTR: network troubleshooting basics When something's slow or unreachable, three classic tools tell you whether it's you, the network, or them. Here's how ping, traceroute and MTR work — and when to reach for each.WatchFor Team3 min read](/blog/ping-traceroute-mtr)[PerformanceApr 08, 2026 ## What is a CDN? (And do you actually need one?) A CDN makes your site faster by serving it from locations close to your users. Here's how that works, what you actually gain, and whether your site needs one.WatchFor Team3 min read](/blog/what-is-a-cdn)[NetworkingApr 04, 2026 ## TCP vs UDP: the difference, explained simply Two protocols carry almost everything on the internet. TCP is the careful courier; UDP is the fast one that doesn't look back. Here's how they differ and when each is the right choice.WatchFor Team3 min read](/blog/tcp-vs-udp)[NetworkingMar 28, 2026 ## IPv4 vs IPv6: what's the difference (and why IPv6 exists)? Every device online needs an address — and we ran out of the old kind. Here's the difference between IPv4 and IPv6, why the switch is happening, and whether you need to care.WatchFor Team3 min read](/blog/ipv4-vs-ipv6)[NetworkingFeb 22, 2026 ## ERR_CONNECTION_REFUSED: what it means and how to fix it Connection refused means you reached the server's door — and it slammed shut. Nothing is listening (or something is blocking). Here's how to track down which.WatchFor Team3 min read](/blog/connection-refused)[NetworkingFeb 14, 2026 ## What is a Network Port? (and how to monitor one) An IP address gets you to the right machine; a port gets you to the right service on it. Here's what ports are, the common ones, and why monitoring them catches outages a website check misses.WatchFor Team3 min read](/blog/what-is-a-network-port)[MonitoringFeb 02, 2026 ## Why Monitor From Multiple Locations? Checking your site from one place gives you one opinion — and it's often wrong. Here's why monitoring from multiple global locations kills false alarms and reveals problems a single check can't see.WatchFor Team3 min read](/blog/global-monitoring-locations)[NetworkingJan 17, 2026 ## HTTP/2 vs HTTP/3: what actually changed HTTP keeps getting faster. HTTP/2 fixed how requests share a connection; HTTP/3 changed the connection itself. Here's what's different, in plain terms, and whether you should care.WatchFor Team3 min read](/blog/http2-vs-http3)[NetworkingJan 11, 2026 ## What is Latency? (and how to reduce it) Latency is the delay between asking for something and getting it — and it shapes how fast everything online feels. Here's what it is, what causes it, and the practical ways to cut it.WatchFor Team3 min read](/blog/what-is-latency)[NetworkingJan 09, 2026 ## Bandwidth vs Latency: what's the difference? “I have fast internet, so why is this slow?” Because speed has two dimensions — bandwidth and latency — and they're not the same thing. Here's the difference, with a simple analogy.WatchFor Team3 min read](/blog/bandwidth-vs-latency)[NetworkingJan 07, 2026 ## What is Packet Loss? (causes, effects and fixes) When data packets vanish in transit, calls stutter, games rubber-band and pages crawl — even on a 'fast' connection. Here's what packet loss is, what causes it, and how to track it down.WatchFor Team3 min read](/blog/what-is-packet-loss) --- Canonical page: https://watchfor.io/blog/tag/networking · Site guide: https://watchfor.io/llms.txt