Sub Application using Forms Authentication

We have SiteFinity using the Claims based authentication.  Then under SiteFinity we have a separate asp.net application that uses Forms Authentication. 

Been having issues trying to get the sub application to load, it comes up with 401 - Unauthorized: Access is denied due to invalid creditals when I have the sub applications authentication set to deny unathenticated users and when I change that to allow all users it doesn't get that error but it doesn't redirect to login either.

I was thinking it probably has something to do with the SiteFinity Web.Config removing the FormsAuthentication module but I tried removing that and changing SiteFinity to use FormsAuthentication and I still got that 401 error trying to access the sub application.

Anyone have any ideas for me for things to try or if its even possible to run a Forms Authentication sub application under Sitefinity using the Claims authentication?