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Resolved Plesk Updates and Upgrades Certificate invalid

Matthl

Basic Pleskian
Hi,

chrome is telling me my plesk admin interface certificate is invalid: "NET::ERR_CERT_AUTHORITY_INVALID" when i klick on "Updates and Upgrades under Tools and Settings". - Tested after writing the thread: Safari also thinks the certificate is invalid.

The certificate works well for the plesk admin interface. It's secured with a valid let's encrypt certificate, issued for the vps host name in Tools & Settings - SSL/TLS Certificates.
It only happens when i click "Updates and Upgrades" in "Tools and Settings" to open the Plesk installer. I have to confirm the invalid Certificate to continue and it works, then. One or two times it asked for the root Password to proceed.

Is this normal behaviour and i never noticed? Can i solve this somehow? Don't know where to start.

Using:
Plesk Onyx 17.5.3 #43 web admin edition
Debian 8.10

Matthl
 
Today evening the "Updates and Upgrades" Page shows a valid certificate again. Don't know what the cause was.
 
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