I'm also facing same kind of issue:
The QlikView server environment is as follows:
OS: Windows, 64 bit virtual machine environment
QlikView server version: 9
Authorization : NTFS Authorization (Windows controls file access)
I'm unable to launch the QlikView client using thin client(IE browser) with either qvp or http protocol.
Using QlikView client 'Open in server' option works fine(qvp://host_address/mount_folder/sample.qvw).
Unable to launch the following urls using thin QlikView client IE browser.
I found the solution.
Open access point: eg: http://localhost/qlikview/index.htm
and open the reports listed in Access Point and whatever url you get out of this, use same url for your application and it should work fine.