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Windows Server 2008 R2 : Understanding Remote Desktop Services (part 5) - Single Sign-On & Remote Desktop Connection Display

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Single Sign-On

This feature allows a user with a domain account to log on once (via a password or smart card) and access RD Session Host servers and virtual desktops without being prompted for credentials again.

The following are some important considerations when using Single Sign-On:

  • Single Sign-On is supported from Windows 7, Windows Vista, or Windows XP with Service Pack 3 clients to a Windows Server 2008 Terminal Server or Windows Server 2008 R2 RD Session Host server. This feature is also supported between Windows Server 2008 R2 to Windows Server 2008 servers or vice versa.

  • The remote machine that a client is connecting to must be authenticated via Kerberos or a server authentication certificate such as SSL. Or, an administrator must enable the Allow Default Credentials with NTLM-Only Server Authentication policy.

  • When saved credentials for a remote machine are already present, those credentials take precedence over the current credentials.

Remote Desktop Connection Display

In the Remote Desktop Connection 6.0 client (and carried over to RDC 7.0), support was added for several new features that are geared toward improving the end-user experience: custom display resolutions, horizontal monitor spanning across multiple monitors, Desktop Experience, Font Smoothing, and Display Data Prioritization.

Custom Display Resolutions

In the previous Terminal Services Client, only 4:3 display resolution ratios and a maximum resolution of 1600×1200 were supported. In the new client, additional display resolution ratios, such as 16:9 or 16:10, and maximum resolution of 4096×2048 are now supported.

There are two ways to set a custom display resolution. The first method is to edit an .rdp file with a text editor. In the file, add or change the following settings:

  • desktopheight:i:<value>

  • desktopwidth:i:<value>

The variable <value> should be defined as the desired resolution. The second method is to define the custom resolution from the command prompt:

  • mstsc.exe /w:<width> /h:<height>

Monitor Spanning

With the monitor spanning feature, a Remote Desktop session can now be spanned across multiple monitors. To use this feature, the monitors used must meet the following requirements:

  • The monitors must use the same resolution.

  • The monitors must be aligned horizontally.

  • The total resolution across all monitors cannot exceed 4096×2048.

Monitor spanning can be enabled using two methods. The first method is to edit an .rdp file with a text editor. In the file, add or change the following setting: Span:i:<value>.

  • <value> = 0, monitor spanning is disabled

  • <value> = 1, monitor spanning is enabled

The second method is to enable spanning from the command prompt:

  • mstsc.exe /span

Desktop Experience

The Desktop Experience feature is used to make a desktop session on an RD Session Host server look and feel like a Windows 7 desktop. When enabled, this feature does the following things:

  • Installs a Windows 7–like desktop, which then enables features such as Windows Media Player, desktop themes, photo management, and so on

  • Allows another feature called Desktop Composition to function; Desktop Composition is used for Windows Aero over a Remote Desktop Connection

Note

Desktop Composition is not supported on a multiple monitor–based Remote Desktop session.


Font Smoothing

An RD Session Host server can provide ClearType functionality to clients via a feature called Font Smoothing. ClearType is a feature that is used to display fonts such that they are clearer and smoother on displays such as an LCD monitor.

By default, ClearType is enabled in Windows Server 2008 and Windows Server 2008 R2. To enable Font Smoothing, use the following procedure on a Remote Desktop Connection client:

1.
Open the Remote Desktop Connection client.

2.
In the Remote Desktop Connection dialog box, click Options.

3.
Now select the Experience tab, and select the Font Smoothing check box.

Display Data Prioritization

In past versions of Terminal Services, a user’s remote session would often become frozen when printing or transferring files. In Windows Server 2008, a feature called Display Data Prioritization was introduced. By design, this feature gives display, keyboard, and mouse data a higher priority over other virtual channel traffic. The result of this design is that virtual channel traffic, such as disk or file transfers, does not adversely affect a user’s ability to interact with a remote session.

By default, the bandwidth ratio with the Display Data Prioritization feature is 70:30. This means that 70% of the bandwidth is reserved for display and input data and 30% is reserved for all other traffic. An administrator can adjust the bandwidth ratios by changing the following Registry values on a Terminal Server or RD Session Host server under the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermDD subkey:

  • FlowControlDisable— Enables and disables flow control

  • FlowControlDisplayBandwidth— Determines relative bandwidth priority for display (and input data)

  • FlowControlChannelBandwidth— Determines relative bandwidth priority for other virtual channels

  • FlowControlChargePostCompression— Determines bandwidth allocation based on precompression or postcompression bytes

New RDC Display Features

The following are new RDC display features that are introduced in Windows Server 2008 R2 Remote Desktop Services:

  • True multiple-monitor support— Now up to 16 monitors of almost any size, resolution, or layout are supported with RemoteApp and Remote Desktop.

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