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Resolved Let's Encrypt Certificate invalid? failed to load resource: net::err_cert_common_name_invalid

ukeller66

New Pleskian
10 days ago I installed a new Server and move my one of my Domains https://www.optiliga.de to this installation. I saved this via plesk with a 'Let's Encrypt' certificate.
All works fine.
Yesterday I looked to the domain and see, it is broken. In console log I find the message "failed to load resource: net::err_cert_common_name_invalid". I checked all and cant finde the failure.
Has anyone an idea, where to seek?
 

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No, not really. After I looking around a little bit, making some experiments with missing TXT-Records, I found the solution.

All CSS, JS, images and so on was loaded with 'https://www.optiliga.de/{the file}'. However, the name of the certificate is correct 'optiliga.de'. After I change the prefix to "'https://optiliga.de'" all works fine.

The question only is, whats the reason, that the old (wrong) version works before (At least some days)?
Anyway, never touch a running system.

Thanks for your support.
 
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