When you open Internet Options - Security tab and click on any Zone (except Internet Zone), the Sites button may be grayed out. As a result, you may be unable to add or remove a website to the specified Zone. Additionally, you may also notice that the Custom level slider is grayed out. This prevents you from customizing the Security level for that particular Zone.
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The Flags value in the registry governs the above two options (and more) for each Zone. See Description of Internet Explorer security zones registry entries for more information on the Flags value. |
To enable the Sites button and the Custom Level slider for that particular Zone, follow these steps:
Open Registry Editor (regedit.exe) and navigate to:
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\{Zone ID}
|
Zone |
{Zone ID} |
|
Local intranet |
1 |
| Trusted sites |
2 |
| Internet |
3 |
| Restricted sites |
4 |
Backup the key by exporting it to a REG file.
In the right-pane, double-click Flags and click Decimal
Add 3 to the existing Value data
Example: If Flags value reads 0 (Decimal), set it to 3 (i.e., 0 + 1 + 2)
Flags value listing (from MS-KB 182569)
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Close Registry Editor and open a new instance of Internet Explorer.
Related article Custom Level and Default Level buttons in Internet Options Security tab are grayed out