Chrome, Edge

ERR_TOO_MANY_REDIRECTS

The browser followed redirect after redirect until it gave up. Two rules are almost certainly pointing at each other.

What causes it

HTTPS redirecting to HTTP which redirects back to HTTPS — classic behind a proxy or CDN that terminates TLS.
A www rule and a non-www rule in opposition.
A CMS setting a canonical URL that conflicts with a server rewrite.
A stale cookie that keeps triggering a login redirect.

If you are the visitor

Clear cookies for that site — this fixes it surprisingly often.
Try a private window.

If it is your website

Trace the chain with a redirect checker and remove the rule closing the loop.
Behind a CDN, honour X-Forwarded-Proto rather than the local scheme when deciding whether to redirect.

Find out whether the site is down for everyone

A live check from our server shares nothing with your network — it settles the question in seconds.

Run a live check

Other connection errors

ERR_CONNECTION_REFUSED DNS_PROBE_FINISHED_NXDOMAIN ERR_NAME_NOT_RESOLVED ERR_CONNECTION_TIMED_OUT ERR_SSL_PROTOCOL_ERROR NET::ERR_CERT_AUTHORITY_INVALID NET::ERR_CERT_DATE_INVALID NET::ERR_CERT_COMMON_NAME_INVALID ERR_EMPTY_RESPONSE ERR_CONNECTION_RESET 503 Service Unavailable 502 Bad Gateway This site can't be reached