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Offering Remote assistance using DCOM is not usually a Teredo scenario because en-
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terprise users are behind a corporate firewall and are not separated from each other by NaTs.
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Remote Assistance can connect across restricted NATs and cone NATs, which generally comprise the large majority of deployed NATs . Beginning with Windows 7, Remote Assistance can also connect across certain types of symmetric NATs, but only if the other computer is not behind a symmetric NAT as well . For more information on NAT traversal support in Windows 7, see 28, Deploying IPv6 . Remote Assistance will not connect in certain configurations . Specifically:
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Remote Assistance will not work if the NAT-enabled router is configured to block the specific ports used by Remote Assistance . See the section titled Remote Assistance and Windows Firewall later in this chapter for more information . Remote Assistance will not work if the User s NAT-enabled router is configured to block all UDP traffic .
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To determine the type of NaT a network is using, open an elevated command
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For more information on IPv6 support in Windows 7, including built-in client support for Teredo and other IPv6 transition technologies, see 28 .
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To verify whether your NAT supports Remote Assistance, you can use the Internet Connectivity Evaluation Tool at http://www.microsoft.com/windows/using/tools/igd/default.mspx . If your NAT supports Universal Plug and Play (UPnP), then Remote Assistance should be able to get a global IPv4 address that allows anyone to connect to you . If your NAT supports Teredo/ IPv6 and you are running Windows 7 or Windows Vista, then an RA Helper that is running Windows 7 or Windows Vista and is Teredo-enabled should be able to connect to you .
Remote assistance and Ip ports Used
The ports used by a Remote Assistance session depend on which version of Windows is running on the two computers involved in the session . Specifically:
Windows 7 to Windows 7, Windows 7 to Windows Vista, or Windows Vista to Windows Vista Dynamic ports allocated by the system in the range TCP/UDP 49152 65535 Windows 7 to Windows XP or Windows Vista to Windows XP (local/remote) Port 3389 TCP
In addition, the Offer RA via DCOM scenario uses port 135 (TCP) .
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If you are concerned about opening the DCOM port (TCp port 135) on your
corporate firewall and want to avoid doing this but still want to be able to offer Remote assistance to remote users, you can do so by using authenticated Ipsec Bypass as described in http://technet.microsoft.com/en-us/library/cc753463.aspx.
Remote assistance and Windows Firewall
The Windows Firewall is configured with a group exception for Remote Assistance . This group exception has multiple properties that are grouped together as part of the Remote Assistance exception . The Remote Assistance exception properties will change depending on the network location of the computer (private, public, or domain) . For example, the default Remote Assistance exception when the computer is in a public location is stricter than when the computer is in a private location . In a public location (such as an airport), the Remote Assistance exception is disabled by default and does not open ports for UPnP and Simple Service Discovery Protocol (SSDP) traffic . In a private network (a home or work network, for example) the Remote Assistance exception is enabled by default and UPnP and SSDP traffic is permitted . In a domain-based enterprise environment, the Remote Assistance exception is typically managed using Group Policy and is enabled by default in Windows 7; it was disabled by default in Windows Vista . The default configuration of the Remote Assistance exception in Windows Firewall varies depending on the firewall profile . Specifically, note the following:
Private profile The Remote Assistance exception in the Windows Firewall is enabled by default when the computer location is set to Private . It is configured for NAT traversal using Teredo by default so that users in a private networking environment (for
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