diff --git a/Dockerfile b/Dockerfile
index 50bd09f..28aae98 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -25,6 +25,11 @@ RUN npx prisma generate && npm run build
 FROM node:22-alpine AS runner
 WORKDIR /app
 ENV NODE_ENV=production
+# Next.js standalone server.js bindet sonst an den von Docker gesetzten HOSTNAME
+# (= Container-ID) statt an alle Interfaces -> Healthcheck (127.0.0.1) und der
+# Coolify-/Traefik-Proxy erreichen den Container nicht (404). 0.0.0.0 behebt beides.
+ENV HOSTNAME=0.0.0.0
+ENV PORT=3000
 RUN addgroup -S app && adduser -S app -G app
 COPY --from=builder /app/.next/standalone ./
 COPY --from=builder /app/.next/static ./.next/static