NPS public cert using GoDaddy

Hi,

I am having heck of time figuring how to use a public cert and nps.  in the forums on this subject I found an solution that points to this link: 

https://support.microsoft.com/en-us/kb/321051

I updated the file to include name of our nps server.  Our internal domain is an extension of our public domain if that matters.   example:  www.example.com is our public name.   Our internal name is .schooldistrict.example.com  in the request.inf I put the nps.schooldistrict.example.com and changed the line from 1024 to 2048 bits.

I submit the CSR to godaddy and installed the certificate and the intermittent.  I assigned it and I get this on a windows 7 machine:

On my iPhone it says the certificate is Not Trusted.   I have heard this comment about just set a group policy to valid the certificate the problem is for your BYOD and telling people to turn off certificate validation would be a pain.

Allen Armstrong