Root causes of the 502 Bad Gateway on all orchestrator proxy endpoints: 1. Orchestrator bound to 127.0.0.1 by default — add HOST=0.0.0.0 to all compose files so the orchestrator is reachable from other containers. 2. Web service missing ORCHESTRATOR_URL in docker-compose.yml and docker-compose.coolify.yml — server-side proxy was falling through to NEXT_PUBLIC_API_URL (the public API URL) which has no /agents or /health endpoints. Add ORCHESTRATOR_URL=http://orchestrator:3001 so the web container routes to the orchestrator service over the internal network. 3. Orchestrator missing ORCHESTRATOR_API_KEY in docker-compose.yml and docker-compose.swarm.portainer.yml — the OrchestratorApiKeyGuard would reject all requests with 401 (or 502 when unreachable first). 4. Web service missing mosaic-internal network in docker-compose.yml — orchestrator was only on mosaic-internal while web was only on mosaic-public, making them unreachable by name. Closes SS-ORCH-001 (issue #534) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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