Web Request Error 5203, but EA works well in other Terminals

[Jefferson Judge Metha]

ok I am totally confused. 
1. Tools ___OPtions ____ExpertAdvisors____ web request activated my websites have been inserted correctly. 

however I am getting an error from this line as res ==-1 

res = WebRequest(req_string, target_url, cookie, referer, timeout, data, data_size, result, headers);
   if(res == -1)
     {
      Print("Error in WebRequest. Error code  =", GetLastError());
      MessageBox("Add the address '" + url + "' in the list of allowed URLs on tab 'Expert Advisors'", "Error", MB_ICONINFORMATION);
     }
   else

the same code on another MT4 Platform runs smoothly with no error. 
what could be wrong.  

With Error 5203