自动登录其他网站

I have an asp.net MVC 4 web application with a URL such as "www.domain1.com", and a new asp.net web form application that is used for ssrs reports. The asp.net web form application uses another URL as "www.domain2.com". For users to view reports, a new link named "Reports" will be created from the asp.net MVC web application site to the new asp.net web form application site. I have an asp.net MVC 4 web application with a