Failed authenticate to Qlik Server after upgrade to version 3

[#1]

I using qlik for web and upgrading from Qlik 2.1.1 to 3.0.0, I dealing with a issues:

Workflow on my application

1. get tiket for make connection
2. my apps will send current login to qlik
3. qlik will login using current user

My method login is using web ticket

this is the respond when i try connect qlik from my app:

Could not authenticate to Qlik Server The remote server returned an error: (403) Forbidden.

This issue not happen in qlik version 2 and no code change after upgrade, otherwise i switch back to qlik version 2 is working fine.

Is any authentication change on version 3?