Guides from the NOC

The DNS server your device is pointed at is not answering. This is a configuration problem on your side, and the fix is almost always one setting.

Chrome could not reach any DNS server at all. That usually means the connection is down - but not always, and the exception is worth knowing.

Getting DNS_PROBE_FINISHED_NXDOMAIN in Chrome? Here's how to tell if it's your device, your DNS records, or nameserver propagation - and how to fix each.

The lookup failed before anything was dialled. Here is how to tell a missing DNS record from a resolver problem on your own machine, and fix whichever one it is.

Chrome says the address is unreachable when the network cannot get a packet to that IP at all. Here is how to tell a stale DNS record from a routing problem.

Chrome prints the same headline for a dozen unrelated failures. The capitalised code underneath is the real error - here is what each one means.

Cloudflare is retiring Page Rules for Redirect, Cache, Configuration & Origin Rules. Step-by-step guide to migrate your redirects and caching without downtime.

Outlook or Thunderbird stuck on 'Searching for your mail server settings'? Fix cPanel autodiscover and autoconfig so mail clients set up email automatically.

Every Let's Encrypt rate limit with the official numbers - 50 per registered domain, 5 per exact set of identifiers every 7 days - and how to fix each one.

Getting a 404 Not Found error on your site? Learn the real causes - deleted pages, broken rewrite rules, DNS mixups - and how to fix each one fast.