So, I've done a little more investigation, but still can't get it to work.
The problem I'm having is with the certificate installation on the iPhone. Failure to get a valid certificate chain is making BlueSocket Authenticator not work.
If I open my institution's Bluesocket log-in page from my PC using Firefox, I get a secure (https://) connection. Double clicking on the lock icon (bottom right), that will bring up the "Page Info" dialog with the security tab selected. From there I can click on "View certificate" which brings up a "Certificate viewer" dialog, and finally clicking the details tab I can see the complete hierarchy for the certificates. In my case there are three certificates in the hierarchy and I can select and export each one in turn, getting three different .crt files. I then emailed these files to myself, opened the email on the iphone and clicked on the attachments to install them, making sure I installed the Root CA first, then the Controller CA, and finally the Site certificate.
After doing all that, all three certificates still indicate "unsigned" on the iphone and when I go to the bluesocket log-in page using Safari on the iphone, I still get the "invalid certificate" error.
Has anyone been able to get a certificate chain installed and working?
The URL for our log-in page is https://220.127.116.11/
I am at a loss as to how to get the certificate chain installed correctly...