We encountered this same issue when we first set up sense. The https page did not work on the ipad becuase of the self signed certificate that Sense configures at initial install. If you want to use ipads over https, which you should, you will need to get a "trusted certificate" from an organization like GoDaddy. Make sure that when you attempt to configure the certificate on the sever you have port 80 enabled because if the configuration fails you will not be able to access port 443. The most common mistake that I have seen made in setting this up is to not include the private key with your certificate, if the cert does not have the key then you won't be able to bind the cert to the ports.
- Get your cert with private key from your certificate authority
- On your server use MMC.exe with the Certificates snap in (computer account/local server) to add the certificate to the Personal Certificate store.
- double click the Certificate and get the Thumbprint from the Certificate details tab, copy the thumbprint to the ssl thumbprint box on the security tab of the central proxy. Click Apply
- Verify the ports were successfully bound using the command line "netsh http show sslcert" you should see the new thumbprint on ports 443 and 4244
- Test your ipad using ssl
Once you have completed your test and you are sure it works then disable port 80 in your proxy settings.
Best of Luck let me know if you have any issues