- Plesk Onyx 17.5 for Windows
Domain certificate cannot be renewed (nor manually, nor automatically) when it is used to secure Plesk panel and/or Plesk mail server.
Let's Encrypt rate limits is exhausted for the domain;
The following error appears in
CONFIG_TEXT: ERR [extension/letsencrypt] Cannot renew certificate on domain example.com with error: Remove certificate failure: One of the certificates you are going to delete is used for securing Plesk.
This is a Let's Encrypt extension bug with ID #EXTLETSENC-95 which will be fixed in future updates.
Apply the resolution from the following article: Failed to renew Lets Encrypt certificate: One of the certificates you are going to delete is used for securing Plesk