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The Key is invalid, expired, disabled, or doesn't match the chosen platform/protocol. Verify the Key, endpoint and protocol.

Too many requests or quota/rate exceeded. Retry later, or check your account quota and rate limits.

The endpoint is misspelled or the domain doesn't exist. Ensure it starts with http:// or https:// and the domain is correct.

The target service is down, the port is wrong, or the network is unreachable. Confirm the service is up and the address is right.

Network or target may be slow — retry later. If deployed on a server, ensure your reverse proxy doesn't buffer SSE.

No. The Key is used only for this check, never stored on our servers; history stays only in your browser.