The homelab is retiring *.schweitz.internal and will rebind host ports to loopback; container-to-container traffic must use container names on docker-dataplane. - SEARXNG_HOST: http://localhost:8087 -> http://searxng:8080 (SearXNG's internal port is 8080; 8087 was the host-published port) - LIBRARY_DESK_HOST: http://localhost:8089 -> http://library-desk:8089 - CORE_API_HOST: http://localhost:8090 -> http://core-api:8083 (8090 is the Scheduler's host port; Core-API serves 8083 internally, confirmed by the housekeeper client and test suite hitting :8083) - scripts/test_housekeeper.sh: reach Core-API via localhost:8083 instead of the LAN IP, which will refuse after loopback rebinding Local development against host-published ports keeps working via .env overrides (.env.example unchanged; localhost stays valid on the host). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>