- Plesk Onyx 17.5 for Windows
Let's Encrypt certificate fails to renew with the following error message:
PLESK_ERROR: Warning: Error installing SSL certificate from Let's Encrypt: Remove certificate failure: The certificate '' can not be set as the default certificate: The private key is missing.
Plesk database inconsistency.
1. Go to Tools & Settings > SSL/TLS Certificates.
2. Select the failed certificate and click Remove to remove it.
3. Go to Domains > example.com > Let's Encrypt, tick the necessary checkboxes to create www and webmail aliases if needed, then click Install to obtain a new certificate for example.com.