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Which ports are needed to active a GPO over mobile computers connecting to my site?

To activate a GPO (group policy object) over mobile computers connecting to my site, which ports should be open on my firewall?
To connect mobile computers to your site, you should be using some kind of secure connection, not opening up all the ports necessary for access to Active Directory. If you set up a VPN, you only need to have the VPN ports open on the firewall. Once the connection is made, everything will be passing through the VPN tunnel, so you will not need other ports open. Everything will look like the VPN to the firewall. You can find info on what ports are needed for a Microsoft VPN at VPN servers and firewall configuration.

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