Check your DB connection string is using the internal Railway/private host, not localhost or external URL.

Most common causes:

Using localhost inside container (won’t resolve)

Wrong DB host (must be Railway-provided internal service URL)

Missing ?sslmode=require (Postgres) or SSL requirement mismatch

Credentials correct but DB not exposed to same network/service

Using public URL instead of internal private networking hostname

Fix:

Use the DB service’s Railway internal connection variable

Redeploy after updating env vars (not just restart)

If still failing, paste the exact auth error log line.

Is your database online and healthy with no error logs?