Issue with Let's Encrypt SSL Renewal

I have a main domain and Sub Domain in it, recently the subdomain SSL (Let’s Encrypt) got expired and I tried to renew manually. But I am getting an error like this “Challange Failed for domain”. Can you please help me with this issue?


  • The following errors were reported by the server:

    Domain: Type: unauthorized Detail: Invalid response from [2400:6180:100:d0::40f:e001]: “<!doctype html><html lang="en"><head><meta charset="utf-8"/><link rel="icon" href="/favicon.ico"/><meta name="viewport" content=”

    To fix these errors, please make sure that your domain name was entered correctly and the DNS A/AAAA record(s) for that domain contain(s) the right IP address.

Already these records have been added.

Thank You

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Hello, @evitras

Are there any additional errors when you run the certbot renewal command:

  1. sudo certbot renew

Have you tried to temporarily disable the redirection to https and give it another go? Also, are you using any CDN like CloudFlare? You can try to temporary disable it as well.

Regards, Alex