Error message when you try to map to a network drive of a DFS share by using a different user name than the one that you used to log on to Windows Vista: "A specified logon session does not exist. It may already have been terminated."

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SYMPTOMS

You log on to your Windows Vista desktop computer by using your regular domain account. When use other credentials to map to a Distributed File System (DFS) share, you receive the following error message:

ERROR_NO_SUCH_LOGON_SESSION winerror. A specified logon session does not exist. It may already have been terminated.

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CAUSE

This behavior occurs when the "Do not allow storage of credentials or .NET Passports for network authentication" Network access policy is enabled.

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WORKAROUND

To work around this behavior, follow these steps:

On the Management Server, click Start, click Run, type gpedit.msc, and then click OK.
Under Computer Configuration, expand Windows Settings, expand Security Settings, expand Local Policies, and then expand Security Options.
In the Policy pane, right-click Network access: Do not allow storage of credentials or .NET Passports for network authentication, click Properties, click Disabled, and then click OK.