HTTP 401 Unauthorized

The endpoint requires authentication and did not accept the request.

What it usually means

The target requires authentication and did not accept the request. Check the credentials or token configured on this monitor.

What to check first

The credentials or bearer token configured on the monitor are current.
The endpoint really is meant to be public, if no credentials are configured.

How ErrorDetector reports it

The target answered, so this is reported as a failed check, not downtime: the alert names the reason, the uptime percentage is untouched, and a recovery notice follows when the check passes again.

Caught by: httpkeywordapi monitors. Read about the api monitoring feature.

Get the cause, not a red dot

Ten monitors free, no card, no time limit. Every incident names the failure.

Start monitoring free

Other causes

DNS · DNS resolution failed (NXDOMAIN, no answer) REF · Connection refused TLS · TLS handshake failed (certificate error) RST · Connection reset by peer NET · Host unreachable (no route) T/O · Connection timed out RDR · Redirect loop (too many redirects) KEY · Keyword not found on the page SLOW · Response slower than the limit ASSERT · API response failed its body assertion BLK · Blocked by a firewall or bot filter 403 · HTTP 403 Forbidden 404 · HTTP 404 Not Found 429 · HTTP 429 Too Many Requests 500 · HTTP 500 Internal Server Error 502 · HTTP 502 Bad Gateway 503 · HTTP 503 Service Unavailable 504 · HTTP 504 Gateway Timeout