Hi @Meidan
checking your domain that's the expected (new) result ( https://check-your-website.server-daten.de/?q=apollo.borealisai.com ).
Why? Your certificate is expired:
CN=apolloapi.borealisai.de
08.07.2019
06.10.2019
1 days expired
apollo.borealisai.com, apolloapi.borealisai.de, www.apollo.borealisai.com - 3 entries
so OCSP returns an unauthorized
answer.
Renew your certificate.