Looks like the StorOnce appliance is using a 1024 bit public key, and IE9 doesn't like this. The certificate is self signed, and you get the normal error, but the "Continue to this website (not recommended)." link is not available:
I did some Googling and found this.
I ran certutil -setreg chain\EnableWeakSignatureFlags 8.
I didn't have to reboot, just logged out and in, and the Web page changed: