If you are getting errors connecting to the Management cockpit using the FQDN of the certificate then chances are you still need to install the certificate on the machine. The SMP 3.0 installation creates the certificate but you still need to install it. Double click on the smp_crt.cer and install to the Trusted Root Authorities Store and then try connecitng to the url in the browser and see if the certificate error is resolved.
--Bill