Auto login not working correctly using API validatelogin. Any help?

[sufi]

I am trying to set auto login from wp to my whmcs site using WHMCS API. Everything is working perfectly, except, it is not let me login automatically.

 

my wp url: wp.domain.com (ip 1) whmcs url: domain.com (ip 2)

 

They are on different IP. so I have used cookie. I have called the validatelogin from wp and it returns uid and upw hash perfectly, which needs to be set on two session variable. But as I am on two different server, I have set them on two different cookie.

 

Now I put this code in top of my whmcs header:

 

{if !$loggedin}
{php}
   session_start();
   $_SESSION['uid'] = $_COOKIE['uidwp'];
   $_SESSION['upw'] = $_COOKIE['upwwp'];
{/php}
{/if}

 

But when I refresh the page, it does not login me, even it does not let me login using my username and passowrd (of whmcs), when cookie is set. I checked the cookie by printing the value in the whmcs site. And it shows correct value. It only works, if I restart the browser (i have set cookie to destroy when browser is closed), do not login to wp site (so no cookie set), then I can login to whmcs site using my username password. Now (keeping whmcs logged in), if I go to wp site, and then log out from the whmcs site, and if i refresh the page, I am auto logged in! But it should have work whenever the cookie is set. Any solution please?