Online Reservation System:
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Let's Encrypt "Challenge marked as invalid" when creating an SSL certificate

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Symptom

You want to create a Let’s Encrypt SSL certificate, the web space control panel displays an error:

Error: Let's Encrypt SSL certificate installation failed: Challenge marked as invalid. Details: Invalid response from http://DOMAIN.TLD/.well-known/acme-challenge ...

 

Cause

The domain was created only minutes ago.

The domain for that you want to install a certificate, has only been created a few minutes ago. It is visible in the web space control panel, but the web server has not yet reloaded the domain configuration. The web space cannot yet be accessed over the Internet. For that reason Let’s Encrypt cannot write files to the web space to verify that the domain exists on the server.

 

Solution

Please wait approximately 15 minutes before you try to add a certificate. It can take up to 15 minutes for the web server to reload the configuration of the newly created domain. Afterwards the web space is accessible for Let’s Encrypt so that you can add a certificate.

 

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