What does a 403 Forbidden error in Postman, specifically related to client certificates, indicate?

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Grade: Education Subject: Support
What does a 403 Forbidden error in Postman, specifically related to client certificates, indicate?
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A 403 Forbidden error in Postman, specifically mentioning 'client certificate required,' signifies that the server requires a client certificate for authentication, and the client (Postman in this case) either isn't providing one, is providing an invalid one, or the provided certificate isn't trusted by the server. The server is refusing to fulfill the request because the client's identity cannot be verified.