Re: IFrame Windows Authentication to On-Premises

Hi Jason,

I understand that you want to develop the SharePoint webparts and with the windows authentication on them. If this is the case, we have specified channel for the development issue, so I recommend you go to our MSDN forum for the further support. At the same time, you can monitor this thread too, because the experienced community may share their suggestions here.

In addition, I have searched some articles for your reference:
http://msdn.microsoft.com/en-us/library/hh147177(v=office.14).aspx.
http://technet.microsoft.com/en-us/library/cc262350.aspx.

Thanks,
Eben Liu