If you found a warning with EventID 1085 on your Windows 7 clients:
Windows failed to apply the Internet Explorer Zonemapping settings. Internet Explorer Zonemapping settings might have its own log file. Please click on the “More information” link.
You can try to troubleshoot it following these steps.
On Details Tap you can found the error code:
In may case is 87 (The parameter is incorrect).
If you check on “Event Viewer\Applications and Services Logs\Microsoft\Windows\Group Policy\Operational” You will find the error with Event-ID 7016:
Completed Internet Explorer Zonemapping Extension Processing in 78 milliseconds.
Check the previous Event-ID 4016 that report the GPO that is causing the issue:
Checking the GPO, I found an invalid entry on “Site to Zone Assignment List”.
To check if an entry is fine or not, you can use a machine that is not managed by GPO trying to add the entry on “Trusted Sites” directly from IE.
It’s interesting to note checking the values you found on
..that also the not valid entry is there.