SSL certificates have expired
APPLIES TO: 2013 2016 2019 Subscription Edition SharePoint in Microsoft 365
Rule Name: SSL certificates have expired.
Summary: SSL certificates in use in the farm have expired and are no longer valid to secure SharePoint resources. Users are now receiving security error messages from their web browsers and client applications when accessing SharePoint resources that use these certificates.
Cause: SSL certificates in use in the farm have expired.
Resolution: Renew or replace these certificates to ensure uninterrupted access to these resources. You can renew or replace these certificates from the Certificate Management page in Central Administration.