根据验证程序，远程证书无效。用twitter进行外部登录

It's an asp.net mvc5 application. Still under development. I am using 'twitter' login. When I click on 'login with twitter', it just throws an error on the screen. This is pretty weird because everything was working good and all of a sudden I see this error.It's an asp.net mvc5 application. Still under d