Here's sequence.
Log onto 99i. Click Admin console
Log into admin console.
Then get pop up with titel "security warning", "ISY is currently configured with the default SSL cart." Two buttons - Disable Internet access and Request/manage SSL certs.
Click Request/Manage SSL cert
New browser window opens
Then get popup "Warning - security", "Java has discovered application components the could indicate a security concern. Name: com.universaldevices.isy.keygen.ui.S ...
"Block potentiall unsafe components being run?"
CLICK No
ISY Config util opens - log in again
CLICK SSL Cert. management
CLICK generate / install new self signed cert
Cert parameters dialog opens
I enter my Dyndns address
Then guess what it worked!