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ITsVISTA KB-Link: KB976110

A terminal server session that is shadowed is incorrectly disconnected when the terminal server session that is shadowing stops shadowing on a computer that is running Windows Vista or Windows Server 2008

Consider the following scenario:

  • The Group Policy Set compression algorithm for RDP data is enabled on a terminal server that is running Windows Server 2008. The algorithm is set to the Optimized to use less network bandwidth option or set to the Optimize to use less memory option.
    Note: By default, these settings are set on a terminal server that is running Windows Server 2008 R2.
  • A user connects to the terminal server that is running Windows Server 2008 or Windows Server 2008 R2 by using Remote Desktop Connection (RDC) client version 6.0 or 6.1.
  • You connect to the same terminal server session by using Remote Desktop Connection (RDC) client version 6.0, 6.1, or 7.0. You remotely control from this terminal server session the terminal server session that was previously made. Then you end the remote control action.
    Note The remote control action is also known as a “Shadowing” action.

In this scenario, the terminal server session that is shadowed is incorrectly disconnected. Additionally, the user receives the following error message:

Because of a protocol error, this session will be disconnected. Please try connecting to the remote computer again

When you use RDC client 7.0 to shadow a terminal server session, you can end shadowing successfully and return to your own session. When you use RDC client 6.0 or 6.1 to shadow a terminal server session, your session is disconnected together with the same error message.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB976110.

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