On a computer that is running Windows Server 2008 or Windows Vista, folder redirection is enabled. You log on immediately after you restart the computer. In this case, Windows Explorer tries to display the desktop before the Workstation service starts, and you experience one of the following problems:
When you try to access redirected folders, you receive the following error message:
\\servername\Username\sharename is currently unavailable.
The Documents, Pictures, Music, and Desktop folders are not visible.
To work around this problem, use one of the following methods.
Method 1: Log off, and then log on again
Windows Explorer uses the Well-Known folder cache. The Well-Known folder cache is initialized during logon. When you log off and then log on again, Windows rebuilds the cache. At this point, you can apply Group Policy settings correctly. Additionally, the cache is populated correctly.
Note For more information about Group Policy settings and about the Well-known folder cache, see the "More information" section.
Method 2: Wait for 12 minutes
The default update interval for the Well-Known folder cache is 12 minutes. To gain access to the redirected folders, wait for the 12-minute update interval to end.
Method 3: Decrease the update interval
You can change the registry to decrease the update interval for the Well-Known folder cache.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
You can decrease the update interval for the Well-Known folder cache by changing two registry values for the KnownFolderSettings subkey. These values control the intervals that are used to update the Well-Known folder cache, based on the success or failure of queries. By default, there is no KnownFolderSettings subkey. Instead, you must create this subkey. To create the KnownFolderSettings subkey and its values, follow these steps:
Click Start, click Run, type regedit, and then click OK.
On the Edit menu, point to New, and then click Key.
Type KnownFolderSettings, and then press ENTER.
Right-click KnownFolderSettings, point to New, click DWORD Value, and then type CachetimeoutSuccess.
Right-click CachetimeoutSuccess, and then click Modify.
In the Value Data field, type a value from 0 to 720000 milliseconds (ms).
Note The CachetimeoutSuccess registry value controls the time-out for cache entries that are populated successfully when the cache is built. We recommend that you set this value to the maximum value of 720000 ms (12 minutes) except when you have to configure the cache to repopulate the settings more frequently. Decreased values may cause an increase in processor and network load. (This increased load is associated with Windows Explorer.)
Right-click KnownFolderSettings, point to New, click DWORD Value, and then type CachetimeoutFailure.
Right-click CachetimeoutFailure, and then click Modify.
In the Value Data field, type a value from 0 to 720000 ms.
Note The CachetimeoutFailure registry value controls the time-out for cache entries that are not populated successfully when the cache is built. We recommend that you set this value to 60000 ms. When you do this, Windows Explorer tries to repopulate failed cache entries after 1 minute. This time frame is sufficient for the Workstation service to complete the initialization process.
Did this fix the problem?
Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support.
Windows Server 2008 and Windows Vista use the Well-Known folders feature to determine the location of folders in the user profile. By using this feature, Windows redirects Well-Known folders to other locations as needed. Specifically, Windows Explorer queries the Well-Known folder GUID. This query returns the actual folder location, whether on a hard disk drive or on a remote server.
Windows Explorer optimizes Well-Known folder lookups by caching the Well-Known folders and their locations. Queries are performed against the cache, and the location is then returned to the application or to Windows Explorer.
When you use folder redirection, you receive the folder redirection settings from Group Policy. This process cannot occur unless the Workstation service has started. If the Workstation service has not started, the Well-Known folder cache is unavailable. This causes queries for redirected folder locations to fail. Additionally, the cache remains unavailable until the next update. By default, this cache is updated every 12 minutes (after the cache is first initialized and built during logon).
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Windows Server 2008 Standard, Windows Server 2008 Enterprise, Windows Server 2008 Datacenter, Windows Vista Enterprise 64-bit Edition, Windows Vista Home Basic 64-bit Edition, Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition, Windows Vista Business, Windows Vista Business 64-bit Edition, Windows Vista Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Starter, Windows Vista Ultimate