Error 1116: A Specifed logon session does not exist. Cannot authenticate against DFS shares (Win 2008)

Error 1116: A Specifed logon session does not exist. Cannot authenticate against DFS shares (Win 2008)

Problem: Unable to access Windows 2008 DFS for Titan users home directory (UNC accounts enabled using Domain Admin account and Titan service running under Domain admin account)

Error you may see in the Titan debug log:

2011-09-02 16:04:14 [2/1680/cf4] Verifying User Home Directory: \\domain\DFSshare\
2011-09-02 16:04:14 [2/1680/cf4] Access to UNC requires authentication: \\domain\DFSshare\
2011-09-02 16:04:14 [2/1680/cf4] UNC Auth Windows error: A specified logon session does not exist. It may already have been terminated.
2011-09-02 16:04:14 [2/1680/cf4] UNC Authenticate failed. Unable to access UNC:
2011-09-02 16:04:14 [2/1680/cf4] UNC Authenticate returned: Unable to query User Database. You do not have adequate rights to perform this operation.\Modify the Local Security Policy for the current User Account so that \'Act as part of the Operating System\' and \'Bypass traverse checking\' are enabled. (Error 1116)Suberror: 1312, A specified logon session does not exist. It may already have been terminated.
2011-09-02 16:04:14 [2/1680/cf4] RESPONSE: 530 Not logged in.

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."

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 win error. A specified logon session does not exist. It may already have been terminated. 

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

To work around this behavior, follow these steps: On the Management Server, clic...To work around this behavior, follow these steps:
  1. On the Management Server, click Start, click Run, type gpedit.msc, and then click OK.
  2. Under Computer Configuration, expand Windows Settings, expand Security Settings, expand Local Policies, and then expand Security Options.
  3. 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 
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