Vishal, see the rest of this document I referenced for you in a different thread you created. Embedding Qlik Sense content into an IIS Website on Different Servers
For this issue, I recommend looking at the stub file component of the document.
Thanks Jeff !!! This is exactly what I wanted. great solution.
So now I have chaining the login process from my portal redirect to qlik and then redirect back to portal.
I wanted to achieve the same thing with logout but not sure what would be the logout URL for qlik in case os SAML Authentication.