Troubleshooting - HTTP File Upload

If you receive any error messages before verifying, please check the below tools for more information: 

   Check for User-Agent filter

During HTTP verification the file needs to be readable for our automated ZeroSSL systems. Some webservers can prevent that and only allow human interaction with a web-browser.

When you get 200 OK everthing is okay.

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It looks like your server has some kind of filter/firewall enabled.

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👉 Check if your website is reachable for ZeroSSL


  curl domain.com/.well-known/pki-validation/
  ABCDEFGHIJKLMNOPQRSTUVWXYZ123456.txt
  

   Check for HTTP redirects

During HTTP verification the file needs to be available via HTTP 200 code. Any kind redirect can influence the verification result.

When you get 200 OK everthing is okay.

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Any redirect with 3XX can prevent verification of your certificate

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The 403 Forbidden status indicates that the server understood the request but refuses to authorize it. Please check your internal server configuration

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👉 Check if your website is reachable via HTTP 200


  curl -vv domain.com/.well-known/pki-validation/
  ABCDEFGHIJKLMNOPQRSTUVWXYZ123456.txt
  


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