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Technical troubleshooting, explained

By TechUtilityTools Editorial Team
MethodologyTransparencyEditorial standards

Most network problems are solved by a methodical checklist, not by intuition. The trick is to test the cheapest, most likely cause first and only escalate when you've ruled it out.

Slow internet checklist

  1. Speed test on Ethernet directly into the router. If fast, the issue is Wi-Fi.
  2. Speed test on Wi-Fi next to the router. If fast, the issue is distance/coverage.
  3. Reboot the modem (90 seconds off, then on). Often clears stuck sessions.
  4. Check whether other devices have the same issue. Single-device = device, all devices = network.
  5. Check ISP status page and outage reports for your area.
  6. If problem persists, capture a few traceroutes and contact your ISP with that data.

Intermittent drops checklist

  1. Run a continuous ping for 5-10 minutes. Note when drops happen.
  2. Compare wired vs wireless drops — wireless-only points to Wi-Fi/router.
  3. Check the router's log if accessible.
  4. Inspect physical cables and connectors at the modem and router.
  5. If drops are time-of-day correlated, it's almost always ISP congestion.

DNS issues checklist

  1. Try the URL on a known-good resolver (1.1.1.1 or 8.8.8.8).
  2. Flush local DNS cache.
  3. Look up the domain on an external DNS tool to confirm public records.
  4. If only one device is affected, check its DNS settings.

Video call quality checklist

  1. Speed test for upload speed specifically.
  2. Switch to wired if possible.
  3. Close background apps that sync (Dropbox, OneDrive, Time Machine, etc.).
  4. Run a packet loss test during the call.
  5. If quality varies by platform, the issue is your ISP's route to that provider.

What to send your ISP

"It's slow" gets you a script reading. Specific data gets you a real ticket. Capture: timestamps, speed test screenshots from multiple times of day, a traceroute to a relevant destination, and a description of which devices and locations are affected. See our diagnostics playbook for the full methodology.