ERR_CONNECTION_TIMED_OUT on Android
Why it happens on Android
On mobile networks the carrier's transparent proxy times out slow origins earlier than a desktop browser does, so a site that is merely slow appears fully down on the phone.
The fix on Android
Retry on Wi-Fi. If it loads there, the origin is too slow rather than offline — the uptime check below reports the actual response time from outside your network.
Is ERR_CONNECTION_TIMED_OUT happening on your domain?
An uptime probe from outside your network tells you whether the server is unreachable for everyone or only from where you are sitting — which is the first fork in every timeout diagnosis.
Free, no signup. Runs from outside your network, which is the only way to tell a server fault from a local one.
If that didn't fix it
Android has its own failure mode, but ERR_CONNECTION_TIMED_OUT has a wider set of causes that apply everywhere. The most common one overall is: the origin server is down or the web server process has stopped.
All causes and fixes for ERR_CONNECTION_TIMED_OUT