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Monday
Oct252010

GPP - Apply and do not reapply - how does is work?

Did you ever wonder how the Group Policy preference feature "Apply and do not reapply" works? Here's how:

All preference items are stored in XML files in the SYSVOL share on the domain controllers. These files are downloaded by the client and processes by the GPP client site exention. All of the GPP settings are store in this xml file, also the options. The Apply once and do not reapply is stored in a entry called FilterRunOnce which is also associated a unique id. This looks like

-<Filters>

<FilterRunOnce hidden="1" not="0" bool="AND" id="{UID}" />

</Filters>

During the first application the UID will be stored in the registry (User: HKCU\Software\Microsoft\Group Policy\Client\RunOnce Computer: HKLM\Software\Microsoft\Group Policy\Client\RunOnce). At the second application of the GPP, the CSE will check if the key with the UID already exists and if yes, it does not apply the GPP anymore.

Also watch out for the item level targeting of GPP - even if the targeting is not met, the UID will be stored in the registry and therefore the GPP may never be applied once the targeting is met.

Also, when you copy & past a GPP, the UID will not be changed and therefore the setting my never be applied (workaround - disable and enable the "Apply once" settings and a new UID will be created).

Gunter

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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com
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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com
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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com
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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com
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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com
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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com
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    GPP - Apply and do not reapply - how does is work? - Server-Log Blog - server-log.com

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