Is there a difference between a 403 Forbidden and a 403 Disallowed User Agent error?

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Grade: Education Subject: Support
Is there a difference between a 403 Forbidden and a 403 Disallowed User Agent error?
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Yes. A standard 403 Forbidden means access is denied regardless of the user agent. A 403 Disallowed User Agent specifically indicates that the denial is due to a robots.txt rule blocking the user agent, typically Google's crawlers. The root cause and solution are different.