Upcoming SSL certificate expirations
APPLIES TO: 2013 2016 2019 Subscription Edition SharePoint in Microsoft 365
Rule Name: Upcoming SSL certificate expirations.
Summary: SSL certificates currently in use in the farm will expire within the certificate expiration attention threshold (60 days by default). Once an SSL certificate expires, it's no longer valid to secure the resource. Users will receive error messages from their web browsers and client applications when accessing web sites that use expired SSL certificates.
Cause: SSL certificates currently in use in the farm will expire.
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.