SSL Error: Unable to verify the first certificate

Good afternoon.

I generated a certificate for the domain rlider.ddns.net (noip), I generated p12 for use in spring boot but I get the following message when making a request in Postman: SSL Error: Unable to verify the first certificate. What can it be?

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Hi @desenvolvimento2

your domain isn't online (the mail ports checked), so it's impossible to check your domain.

Normally, that error says: Your server doesn't send the intermediate Letsencrypt certificate.

That's required to validate your certificate.

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Can you show the exact command you used to do that?

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Thank you for your help. The problem was exactly in the command to generate the p12. I generated it again and the problem was solved.

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