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Windows Server 2003 : Supporting and Troubleshooting Terminal Server (part 4) - Managing and Troubleshooting Terminal Server - Device Redirection

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2.3 Device Redirection

Once a user has successfully connected, Windows Server 2003 and the Remote Desktop Connection client provide a wide array of device redirection options, including:

  • Audio redirection, which allows audio files played within the terminal server session to be played by the user’s PC. This feature is specified on the Local Resources tab of the Remote Desktop Connection client, shown in Figure 4. However, audio redirection (or audio mapping) is disabled by default on the Client Settings tab of the RDP-Tcp Properties dialog box, as seen in Figure 10. Audio redirection can be specified by a GPO.

    Figure 10. The RDP-Tcp Properties dialog box Client Settings tab

  • Drive redirection (or drive mapping), which allows the user to access drives that are local to the user’s PC from within the terminal server session. Local drives are visible in My Computer under the Other group, as seen in Figure 11. This option is disabled by default and can be enabled on the Local Resources tab of the Remote Desktop Connection client. Terminal Server Configuration can override the client setting and disable drive redirection from the properties of the connection. These settings can also be specified by group policy. The user account’s Connect Client Drives At Logon setting does not affect drive redirection using the Remote Desktop Connection client—it is meant to manage drive redirection for Citrix Integrated Computing Architecture (ICA) clients.

    Figure 11. My Computer in a terminal server session showing redirected client drives
  • Printer redirection (or Windows printer mapping), which allows the user to access printers that are local to the user’s PC, as well as network printers that are installed on the user’s PC, from within the terminal server session. The Printers And Faxes folder will display printers that are installed on the terminal server as well as the client’s redirected printers, as shown in Figure 12.

    Figure 12. The Printers And Faxes folder, which shows a client’s redirected printer

    Like drive redirection, printer redirection is specified on the Local Resources tab of the Remote Desktop Connection client. Printer redirection can be disabled by properties of the RDP-Tcp connection. Printer redirection will also be disabled if the Connect Client Printers At Logon setting is not enabled in the user account properties, shown in Figure 13. Interestingly, checking this option in the user account does not cause printer redirection to occur—the client must specify redirection on the Local Resources tab—but if this option is disabled, the user account setting will override the client setting. The user account properties also provide a Default To Main Client Printer setting which, if enabled while printer redirection is in effect, will set the default printer in the terminal server session to the same printer set as default on the user’s PC. If the Default To Main Client Printer setting is disabled, the terminal server session will use the default printer of the terminal server computer. Printer redirection settings can be specified by a GPO.

    Figure 13. The Environment tab of a user’s properties dialog box

  • Serial Port redirection, which allows a user to launch an application within a terminal server session that uses a device, such as a bar-code reader, attached to the serial port of the user’s PC. This feature is on the Local Resources tab of the client and can be disabled in the properties of the RDP-Tcp connection. Serial port redirection can be specified by a GPO.

  • LPT and COM port mapping, which allow a user to install a printer within the terminal server session that maps to a printer attached to an LPT or COM port on the user’s PC. This method of printer redirection is not necessary with Windows Server 2003 and the Remote Desktop Connection client, which support printer redirection in a much simpler way, as described previously. LPT and COM port mapping are, however, still done by default. The RDP-Tcp connection properties can disable port mapping, as can a GPO.

  • Clipboard mapping, which allows the user to copy and paste information between a terminal server session and the desktop. This feature is enabled by default in the Remote Desktop Connection client and cannot be changed within the client’s user interface (UI). The RDP-Tcp connection properties can disable clipboard mapping, as can a GPO.

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