I've followed the instructions in the following How to: Create a basic provider-hosted app for SharePoint
I can press F5 and deploy the app successfully to my Office 365 Developer Site. When I try to launch the application I get "There is a problem with this websites' security certificate" error. I ignore and continue to website but then I get a WebException was unhandled by user code error - The remote server returned an error: (407) Proxy Authentication Required. - Proxy authentication required.
Do you have any suggestions as to what might be the cause? Or what I can try to fix? Thanks