какой ключ?
https://support.microsoft.com/en-us/help/4500571/update-rollup-for-configuration-manager-current-branch-1902
Client computers that use IPv6 over UDP (Teredo tunneling) may generate excessive traffic to management points. This, in turn, can also increase load on the site database.
This traffic occurs because of the frequent network changes that are associated with the Teredo refresh interval. After you apply this update, this data is filtered by default and is no longer passed to the notification server on the management point. This filtering can be customized by creating the following registry string under HKEY_LOCAL_MACHINE\Software\Microsoft\CCM:
Type: String
Name: IPv6IFTypeFilterList
Value: If the string is created without any data (blank), the pre-update behavior applies and no filtering occurs.
The default behavior of filtering Teredo tunnel data (interface type IF_TYPE_TUNNEL, 131) is overwritten if new values are entered. Multiple values should be separated by semicolons.