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Issue Certificate for Plesk login broken?

Puma7

New Pleskian
Hi,

for some reason I was able to break my main Lets encrypt certificate. If I want to access to login Page HSTS blocks the request with the reason "NET::ERR_CERT_AUTHORITY_INVALID".
Now I still can access Plesk direct via IP address, but I would like to fix the issue. The trouble is I have already tried to Renew the certificate via the Lets encrypt plugin, but it didn't fix the Problem.
Right now I have now clue what broke the certificate and I already used the Plesk repair all command, which didn't help.

upload_2019-3-6_9-46-51.png

upload_2019-3-6_9-48-40.png
 
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