Trying to install an app through UMC on a remote server fails.
You will notice an error like this:
03.02.20 12:46:23.853 MODULE ( ERROR ) : Error during remote appcenter/invoke: ('Could not send request.', CertificateError("hostname u'ucs' doesn't match '*.local.multi.ucs'",))
As there is a wildcard certificate installed the hostnames do not match. UCS tried to connect to the short name while the wildcard certificate only matches for the FQDN.
To fix, re-configure
/etc/apache2/site-enabled/default-ssl.conf to use the UCS provided certificates.