IE gets wrong Security Zone when accessing SSRS Reports

I have some machines that when accessing SSRS Reports show Internet or Unknown Zone(Mixed) instead of Local Intranet. Some user never report this problem, for others it appears consistent. These machines should be all setup the same. We access the SSRS reports with a url like http://test-intranet.example.com. Have checked the security settings on the IE and that should consider all *.example.com pages as local intranet. Very annoying this issue, anybody having a clue what开发者_运维问答 component doesn't play well here ?

In the IE connection settings do all of your machines ignore local proxy server for the address you mentioned.

Assuming it's internal, and assuming you have a proxy, then there should be no need going to the proxy for internal addresses.

Have you added the Kerberos Token Size hot fix (KB327825) to the machines (desktops and servers)? You'll also want to roll out the registry setting via a script or GPO (kb938118).