I am currently trying to run 2 Zimbra servers, and share calendars between them. Both are running in SSL only mode, with self-created certificates. When I try to add a shared calendar from one to the other, it fails due to the certificate not being trusted.

 com.zimbra.common.service.ServiceException: resource unreachable: IOException: javax.net.ssl.SSLHandshakeException: java.security.cert.CertificateException
: Untrusted Server Certificate Chain
etc. I don't know how to add the certificate from the other server, or which cert to add. Anyone know how to do this?