I know I should remove the cert connection to a domain if it was there. But my question was "HOW can I find" this domain. Because the one domain I used this cert I already switched to the new certificate. I also tried to switch it to "not selected" and also switched SSL off, but I still can't remove the cert. I looked in the database "psa" but can not find the usage of this certificate. I see only the new certificate used. So, I still don't know where is Plesk getting the info, that this certificate is used?