Login to UMC fails if the LDAP server uses a certificate that was not signed by the internal eDir RSA CA. This is because /opt/novell/umc/scripts/edirapi-configure.sh copies only /etc/opt/novell/certs/SSCert.pem into the eDirAPI docker container before it starts.
The script should at least also copy the ECDSA CA (/etc/opt/novell/certs/SSECCert.pem) into the container. Or better this should be configurable (multivalue) in case you use certificates signed by an external CA or several of different CAs.