--- title: Networking description: 31 Networking articles — guides and explainers from the WatchFor team. canonical: https://watchfor.io/blog/category/networking --- [All posts](/blog) # Networking Guides, how-tos, and updates on 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 [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 22, 2026 ## HTTP Status Codes Explained: what 404, 500 and 503 really mean Every status code is your server trying to tell you something. Here's a plain-English guide to the ones you'll actually meet — what they mean, whose fault they are, and what to do about each.WatchFor Team4 min read](/blog/http-status-codes-explained)[NetworkingJun 16, 2026 ## How to Never Get Caught by an Expired SSL Certificate An expired TLS certificate takes your whole site offline with a scary red warning — and it's 100% preventable. Here's why certificates expire, what it costs, and how to make sure it never catches you.WatchFor Team3 min read](/blog/ssl-certificate-expiry)[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 13, 2026 ## 502 Bad Gateway: what it means and how to fix it A 502 Bad Gateway means the server in front of your app couldn't get a valid response from the app itself. Here's what's really happening, the usual causes, and how to fix — and prevent — it.WatchFor Team4 min read](/blog/502-bad-gateway)[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)[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)[NetworkingApr 15, 2026 ## 503 Service Unavailable: what it means and how to fix it A 503 means your server is alive but can't handle the request right now — usually overload or maintenance. Here's what's happening, how to fix it, and how to keep it from surprising your users.WatchFor Team3 min read](/blog/503-service-unavailable)[NetworkingApr 11, 2026 ## 504 Gateway Timeout: what it means and how to fix it A 504 means a proxy waited for your app to respond — and gave up. It's the signature of something slow, not something dead. Here's how to find the slowness and fix it.WatchFor Team3 min read](/blog/504-gateway-timeout)[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)[NetworkingMar 12, 2026 ## 404 Not Found: what it means and how to handle it 404 is the internet's most famous error — and unlike most, it's often nobody's emergency. Here's what it means, when it's fine, when it isn't, and how to handle it well.WatchFor Team3 min read](/blog/404-not-found)[NetworkingMar 10, 2026 ## 403 Forbidden: causes and how to fix it A 403 means the server understood you perfectly — and is refusing anyway. Here's what causes 'Forbidden', how it differs from 401, and how to track down the fix.WatchFor Team2 min read](/blog/403-forbidden)[NetworkingMar 08, 2026 ## 401 vs 403: Unauthorized vs Forbidden 401 and 403 are the two 'you can't have this' codes — and they're constantly confused. Here's the simple rule for telling them apart, with examples.WatchFor Team3 min read](/blog/401-vs-403)[NetworkingMar 06, 2026 ## 500 Internal Server Error: what it means and how to fix it 500 is the server's way of saying 'something went wrong and I don't know how to explain it.' Here's what causes it, how to find the real error, and how to stop it recurring.WatchFor Team3 min read](/blog/500-internal-server-error)[NetworkingMar 04, 2026 ## 301 vs 302 Redirects: which one should you use? Both send visitors from one URL to another — but to search engines they mean very different things. Use the wrong one and you can quietly tank your SEO. Here's the difference.WatchFor Team3 min read](/blog/301-vs-302-redirects)[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) --- Canonical page: https://watchfor.io/blog/category/networking · Site guide: https://watchfor.io/llms.txt