# Common errors and troubleshooting paths

Resolve authentication, rate-limit, billing, and connection issues quickly.

- Category: Troubleshooting
- Reading time: 10 分钟
- Locale: ja

## 401 UnauthorizedCheck your session, Access Key, and whether the request uses the correct API or Tunnel host.
## 402 BILLING_LIMITThe account reached its overage budget. Increase the budget in the console or wait for the next period.
## 429 Rate LimitedAnonymous Quick Tunnels have creation limits. Wait for the window to reset or use a Persistent Tunnel after signing in.
## 503 Service UnavailableCheck Auth0 configuration, Worker secrets, and D1 migrations. Keep the same Idempotency-Key when retrying a create request.