c# - Stuck in fetching Tokens from ebay -

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using c# mvc 5. problem occuring after hosting app in iis 8.

when view page loads, loads anchor(get token) redirects ebay sign in page runame , session name(runame & sessionid loaded in controller , passed via viewbag , bound anchor tag click event).

in controller: 

apicontext.signinurl = "https://signin.sandbox.ebay.com/ws/ebayisapi.dll?signin&runame=" + apicontext.runame + "&sessid=" + _sessionid; viewbag.sign = apicontext.signinurl; viewbag.sessionid = _sessionid;

in view :

$("#ebaysignin").click(function () {          var childurl = "@viewbag.sign";         sessionid = "@viewbag.sessionid";         alert(sessionid);         var timer = setinterval(checkchild, 500);         var isclosed = false;         function checkchild() {             if (child.closed) {                  clearinterval(timer);                 var url = '@url.action("accebayfinalreturn", "settings")';                 $.ajax({                     url: url,                     type: 'post',                     data: json.stringify({ sessionids: sessionid }),                     datatype: 'json',                     contenttype: 'application/json',                     success: function (data) {                         alert('succ');                     },                     error: function (data) {                         alert('error.');                     }                 });             }         }     });

the sign in page loads in child window correctly.

after "i agree" in ebay consent form (after sign in) window closed.

in main window catch event of closing child window , send sessionid view controller through ajax(code given above). in controller call fetchtoken apicontext , valid sessionid. 

try         {             fetchtokencall ftc = new fetchtokencall(apicontext);             _token = ftc.fetchtoken(_sessionid);             return _token;         }         catch (exception)         {             return null;         }

but unfortunately fetchtoken returns nothing. how solve it?


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