Define file shares for downloading definition updates

This policy setting allows you to configure UNC file share sources for downloading definition updates. Sources will be contacted in the order specified. The value of this setting should be entered as a pipe-separated string enumerating the definition update sources. For example: “{ -> -> unc1 | -> -> unc2 }”. The list is empty by default. If you enable this setting the specified sources will be contacted for definition updates. Once definition updates have been successfully downloaded from one specified source the remaining sources in the list will not be contacted. If you disable or do not configure this setting the list will remain empty by default and no sources will be contacted.

Additional Information

  1. Registry path is:

    HKEY_LOCAL_MACHINE -> Software -> Policies -> Microsoft -> Windows Defender -> Signature Updates # DefinitionUpdateFileSharesSources; HKEY_LOCAL_MACHINE -> Software -> Policies -> Microsoft -> Windows Defender -> Signature Updates # DefinitionUpdateFileSharesSources

  2. The Administrative Template path is:

    Windows Components -> Windows Defender -> Signature Updates


* Making mistakes while changing registry values can affect your system adversely. We recommend you to create a System Restore point before making registry manipulation. If you're new to Registry Editor, read this beginner's guide.
** To locate the registry and administrative template path, checkout beginner's guide.
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