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Under MAS, Synapse returns M_UNRECOGNIZED for the login endpoints, so the mess-auth-compat router (priority 1000) sends /_matrix/client/*/login, /logout and /refresh to MAS while everything else stays on Synapse. Cloudflare A record for auth.hobbs.farm already existed (98.160.103.126, DNS-only). Blackbox probes added for MAS internal health (:8021) and the public discovery endpoint; all four matrix-related probes UP. Snapshot of the node's traefik dynamic config committed for reference. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>