The auto-sync condition "[STATUS] < 400" reads as red for any site behind
Authelia's forward_auth: Gatus's probe is never logged in, so it correctly
gets a 401 back every time — the site is completely healthy, Authelia is
just doing its job, but that 401 fails the condition. Confirmed live: every
site the user actually logs into showed permanently red.
That single condition also had the opposite bug in reserve: on a genuine
outage (connection refused, DNS failure, TLS failure), Gatus reports
[STATUS] as 0, and 0 < 400 is true — a fully unreachable site would have
silently read as "up".
Fixed to two conditions together: "[CONNECTED] == true" (catches the actual
outage case) and "[STATUS] < 500" (accepts any real response, including
401/403/redirects from an auth gate, only failing on Caddy's own 502/503/504
when the backend itself is unreachable).
Also changed the sync loop to refresh conditions on already-synced
endpoints, not just add-missing-ones — the old add-if-missing-only logic
meant this fix would only apply to newly discovered domains, leaving every
already-synced site (which is most of them, on a live box) stuck on the
broken condition forever until removed and re-added by hand. Now every
sync run (every 15 minutes via the existing systemd timer, or the one that
happens immediately on a Gatus reinstall) self-heals all of them.
Verified end-to-end against the real mikefarah/yq binary: an existing
caddy-sync entry gets its conditions rewritten in place, an unrelated
manually-added endpoint is left untouched, and a newly-discovered domain
gets the corrected conditions from the start.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4k6J1qXXyYxhGEgnJaMvn
Claude
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