user getting the error and stuck at https://xxxxxxxxx.idp.com/saml/idp/profile/rederictorpost/sso

page cannot be displayed when user trying to access SP portal. SP initiated connection. user getting the error and stuck at https://xxxxxxxxx.idp.com/saml/idp/profile/rederictorpost/sso ...

only few users .. Others can use with no issues ... What is the issue here checked authentication , works fine .. no issue with authentication.