--- title: #debugging description: 13 articles about debugging — guides and explainers from the WatchFor team. canonical: https://watchfor.io/blog/tag/debugging --- [All posts](/blog) # #debugging Articles tagged "debugging". [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) 13 article s [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)[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 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)[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 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)[MonitoringMar 02, 2026 ## CORS Errors Explained (and how to fix them) Every web developer meets the dreaded 'blocked by CORS policy' error. It's not a bug — it's a security feature. Here's what CORS is, why the browser blocks your request, and how to fix it properly.WatchFor Team3 min read](/blog/cors-errors-explained)[PerformanceFeb 28, 2026 ## ERR_TOO_MANY_REDIRECTS: causes and how to fix it When a page keeps redirecting to itself, the browser gives up with 'too many redirects'. Here's why redirect loops happen and the usual culprits behind them.WatchFor Team3 min read](/blog/too-many-redirects)[SecurityFeb 26, 2026 ## SSL/TLS Handshake Failed: causes and how to fix it When the secure connection can't be agreed, you get a handshake failure — and the page never loads. Here's what goes wrong during the TLS handshake, and how to fix each cause.WatchFor Team3 min read](/blog/ssl-handshake-failed)[SecurityFeb 24, 2026 ## Mixed Content Warnings: what they are and how to fix them Your site is on HTTPS, but the padlock has a warning — or images won't load. That's mixed content: a secure page pulling in insecure resources. Here's how to find and fix it.WatchFor Team3 min read](/blog/mixed-content-warnings)[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)[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/debugging · Site guide: https://watchfor.io/llms.txt