`channels status --probe` prints warnings when it can detect common channel misconfigurations, and includes small live checks (credentials, some permissions/membership).
- Logs show `HttpError: Network request for 'sendMessage' failed` or `sendChatAction` → check IPv6 DNS. If `api.telegram.org` resolves to IPv6 first and the host lacks IPv6 egress, force IPv4 or enable IPv6. See [/channels/telegram#troubleshooting](/channels/telegram#troubleshooting).