I'm using Web Data Connector to get data to Tableau Desktop, which is working with simulator but not with actual application. It seems from the log, cookies created during the authentication phase of of Web Data Connector are missing in the headless browser session of the application. I'm using these cookies for user authentication.
Here is the basic flow,
User enter Web Data Connector url
Check user authenticated
If authenticated goto step 3
Else redirect to authentication page and establish cookies goto step 2