Proxy Servers in Visual C#.NET

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If only one of the participants in a Remote Assistance session is behind a NAT device, then there is not a problem. However, if both users are situated behind their own NAT devices on different private networks, the Remote Assistance session will not be established. It is this impasse that is overcome by the UPnP NAT devices mentioned earlier.
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Proxy Servers
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Proxy servers are used for a variety of reasons. They can be used to cache commonly accessed Internet content so that when a user on a private LAN requests a resource, the proxy server can provide the requested materials from its cache of stored materials rather than actually going to the Internet to retrieve the resource. This allows a proxy server to make the most out of limited Internet connections that might otherwise be over utilized and ineffective. Proxy servers can also be used as a security and policy enforcement tool. Proxy servers can be used to track the Internet activity of the users required to use them as gateways to other networks. Because many proxy servers log incoming and outgoing activity, potential security breaches can be analyzed when they are detected. If a proxy server is in use between the novice and the expert in a Remote Assistance session, and if the expert is behind a proxy server, such as Microsoft Proxy Server 2.0, the expert must have the proxy server client installed. This client allows the expert to pass through the proxy as the client would when Web browsing. If, however, the novice system lies behind the proxy server, packet filtering will have to be configured on the proxy server to allow inbound connections on port 3389 to the novice system.
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5: Advanced Networking
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Part 5: Advanced Networking
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Enabling Remote Assistance
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Before your computer can use Remote Assistance, you must make sure the feature is enabled. (It s enabled by default in both Windows XP Professional and XP Home Edition.) Follow these steps:
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1 Open Control Panel and double-click System. 2 On the Remote tab, select Allow Remote Assistance Invitations To Be Sent
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From This Computer, as shown here.
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3 Click the Advanced button. You can use the dialog box shown in the following illustration to allow the expert to control your machine when connected via a Remote Assistance session. Note that if you do not enable remote control, the expert will be able to see your computer, but will not be able to make any configuration changes. You can also specify the maximum period of time that an invitation can remain active. By default, an invitation is good for one hour, but you can change this value if necessary when you create each invitation.
5: Advanced Networking
16: Remote Desktop and Remote Assistance
note You only need to enable Remote Assistance if you plan on asking for assistance. You
can accept remote assistance invitations without enabling Remote Assistance on your computer.
Requesting Remote Assistance
Requesting remote assistance can take several forms, from using messaging software such as Windows Messenger to saving an invitation file to a floppy disk and hand delivering it to the expert. The easiest place for the novice to start is the Window XP Help And Support Center. Follow these steps:
1 From the Start menu, choose Help And Support. 2 Under the Ask For Assistance section, click the link labeled Invite A Friend To
Connect To Your Computer With Remote Assistance.
3 On the Remote Assistance page that appears, click the Invite Someone To
Help You link, as shown here.
4 You can request assistance of an expert in three different ways:
I Use Windows Messenger. Sign in to Windows Messenger if you re not already online, choose an expert from the Online list, and click Invite This Person. The expert receives the request in Windows Messenger and can accept your invitation.
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5: Advanced Networking
Part 5: Advanced Networking
Note that you can also bypass the Windows Help And Support Center and use Windows Messenger directly to start a Remote Assistance session. In Windows Messenger, choose Actions, Ask For Remote Assistance. I E-mail. You can send the invitation via e-mail by entering the e-mail address in the Type An E-mail Address box and then clicking the Invite This Person link below it. In the window that appears, enter your name and a message and click Continue. In the next window, specify a time duration for the invitation and enter a password the user must enter to access your computer. Click Send Invitation. The message is entered in your default mail client (such as Outlook Express). As shown in Figure 16-14, the e-mail contains instructions and a file called rcBuddy.MsRcIncident. When the user receives the file, he can doubleclick the attachment to start the Remote Assistance session.
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