I am using openfire 3.6.0. I just purchased a wildcard SSL certificate *.domain-name.com. In Openfire our server name is im.domain-name.com. I went to Server >> Server Settings >> Server Certificate and click on Import.
Typed in the passphase, Content of Private Key file and Content of Certificate file. I copied the content from Plesk where the certificate was originally created. The status says “CA signed”. But when I go to Server page, beside the Server Name it shows ! icon with “Found RSA certificate that is not valid for the server domain”.