nginx sat on two Docker networks (Coolify's shared per-app network,
where coolify-proxy lives, plus our custom "mandant" bridge). With
no explicit traefik.docker.network label, Traefik's Docker provider
picked one non-deterministically across deploys — when it picked
"mandant", its backend connection went to an unreachable network and
silently hung after completing the TLS/HTTP handshake with clients.
All services already share Coolify's injected network, so the custom
network was redundant. Removing it leaves each container on exactly
one network, eliminating the ambiguity.
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