This message indicates that the standard HTTP-based validation can’t be performed. The likely reason is that your domain configuration is set to use a wildcard subdomain. Wildcard certificates (e.g., *.example.com) often require DNS-01 validation, which is more complex and can’t be done automatically in some scenarios.
Why Disabling the Wildcard Subdomain Helps:
By turning off the wildcard subdomain option, you switch back to a setup where the certificate can be validated using the simpler HTTP-01 method. This method is straightforward and allows the SSL provider to confirm domain ownership without needing DNS changes.
How to Fix the Issue:
- Go to Your Domain Settings:
Navigate to the “update domain name” settings block.
- Disable the Wildcard Subdomain:
Locate the option that says “Enable wildcard subdomain” and remove the checkmark (untick the box).
- Save Your Changes:
Click the “Update” or “Save” button to apply your new domain settings.
- Reinstall the SSL Certificate:
Once the wildcard is disabled, retry installing the SSL certificate using the HTTP-01 validation method. The process should complete successfully this time.
In Summary:
You can install free SSL certificates like Let’s Encrypt or ZeroSSL easily when using standard domain validations. If you run into the “HTTP-01 not possible” error, it’s often because a wildcard subdomain is enabled. Simply disable the wildcard, update your domain settings, and try again. This quick fix allows the automatic validation to work smoothly, securing your site with a trusted, free SSL certificateb