We migrated the DNN site to new server. the code and the backend DB also moved to new server.But when we try to login from login page we are facing the issue we can't able to login.We have integrated active directory in it. But when we browse the site from 

/DesktopModules/AuthenticationServices/ActiveDirectory/WindowsSignin.aspx we can able to login with our LDAP account. Can you please let me know what was the issue with login screen.