Good afternoon.
This problem is related to the fact that Let's Encrypt expired on September 30, 2021, the IdenTrust DST Root CA X3 root certificate.
Your site diademagrand.com.ua has a certificate from Let's Encrypt installed.
Replace the certificate on the diademagrand.com.ua website (not from Let's Encrypt) or on the box server, you need to add an exception for the certificate.
More details here
https://habr.com/ru/post/580092/