SSL mapped domain not trusted

Hi!

I setup a multisite and everything works (after 3 weeks). I mapped a domain: purls.nl with an a-record to a dedicated ip. (to purls.websitelight.nl)

The problem now is that the certificate is not trusted. (purls.nl is not encluded in the wildcard SSL) What to do?

Please let me know.

Regards

Erik Plomp