Ja, da bin ich mir doch recht sicher, sagt M$ ja selber:
Remote Assistance uses the Remote Desktop Protocol (RDP) to establish a connection between a user requesting help and a helper providing it. The RDP uses TCP port 3389 for this connection. To allow users within an organization to request help outside your organization using Remote Assistance, port 3389 must be open at the firewall. To prohibit users from requesting help outside the organization, this port should be closed at the firewall.
Refer to the instructions for administering the firewall for information about opening or closing port 3389.
Notes:
If you close port 3389, you will block all Remote Desktop and Terminal Services through this port. If you want to allow these services but want to limit Remote Assistance requests, use Group Policy.
Microsoft’s Internet Connection Firewall, which is designed to be used only with stand-alone computers or computers in a workgroup, does not block Remote Assistance traffic. |