What's the difference between a 503 and a 504 error in WordPress?

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Grade: Education Subject: Support
What's the difference between a 503 and a 504 error in WordPress?
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A 503 error indicates a *server-side* problem – the server is unresponsive. A 504 error indicates a *client-side* problem – your browser or device is unable to connect to the server. They are often the same, but a 503 is generally considered a more serious issue.