Sorry for the delay in replying. Exam marking time. If mnet is trying to connect through the https on your SAM no way. It cant authenticate. You need to bypass SAM.
Try changing the instance name in the Moodle Admin panel and hope that admin has got the DNS correct. Then regenerate the certificates. Try again.
Mnet has it's own certificates that it shares with other moodles. The base problem will be that the certificate is generated for the domain name not the machine name.
The domain name will be something like www.mymoodle.com/moodleA the machine it runs on beastie.mymoodle.com.
This may take a bit of thinking. As WM S once penned "Whats in a name?" heaps when it comes to certificates.
John