When you view local drives or mapped network drives in Microsoft Windows Explorer, the left pane (folder tree) or the tree view may flicker, or the whole folder structure may constantly be updated with speeds that vary from one update every few seconds to one every few minutes. Therefore, users who are logged on to a Microsoft Windows Server 2003-based terminal server may experience performance issues with Windows Explorer.
If you open a folder to a network share on a Windows Server 2003 server and then perform a Network Monitor trace, you may notice that server message block (SMB) keepalive packets are sent every 32 to 33 seconds.
This problem occurs because if you map a drive to a share on a server and then changes occur in the file system of the folder structure on that mapped drive, Windows Server 2003 sends change notify packets to report these changes to the client computer. On the client computer, Windows Explorer updates the open window when it receives a file change notification.
Note Excessive flickering can also be caused by antivirus software or by another third-party program that constantly updates the folder or the folder tree on the server that clients are connected to.
To resolve this problem, apply the hotfix that is described in this article, and then enable one of the following registry entries:
You must configure one of these registry entries to modify the default behavior in Windows. For additional information about how to do this, see the "Installation information
" section of this article.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix. Note
If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note
The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
No prerequisites are required.
You must restart your computer to apply the changes after you apply this hotfix. However, you do not have to restart the computer immediately after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone
tab in the Date and Time tool in Control Panel.
Windows Server 2003, 32-Bit Editions
Date Time Version Size File name -------------------------------------------------------- 06-Nov-2003 02:18 6.0.3790.100 8,168,448 Shell32.dll
Windows Server 2003, 64-Bit Editions
Date Time Version Size File name Platform -------------------------------------------------------------------- 06-Nov-2003 02:17 6.0.3790.100 12,953,600 Shell32.dll IA-64 06-Nov-2003 02:18 6.0.3790.100 8,168,448 Wshell32.dll x86Important
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:
How to back up and restore the registry in Windows
After you apply this hotfix, create the
registry entry or the
registry entry in one of the following registry subkeys:
If you create the entry in the
registry hive, the setting is applied only for the currently logged-on user. If you create the entry in the
registry hive, the setting is applied to all users who log on to the server. Create one of the following registry entries:
- Entry name:
0 (the default) or
A setting of
1 for this registry entry turns off Change Notify requests for file changes and for folder changes that occur in level 2 (and below) subfolders of a mapped network share. The server still sends a Change Notify event when a file or a folder is changed in the root of the mapped network share. However, the server does not send a Change Notify event when a change is made in the second subfolder or in a deeper subfolder of the mapped network share. By default, the setting for the
NoRemoteRecursiveEvents registry value is
- Entry name:
0 (the default) or
A setting of
1 turns off Change Notify requests for file changes and for folder changes on mapped network shares.
Note If you set this value to
1, change notifications on network drives are disabled. You must press F5 or click Refresh on the View menu in Windows Explorer to manually update the changes in the current folder of a network share.
When you enable the
registry entry or the
registry entry on a computer that uses a network-based configuration (for example, a %USERPROFILE% variable that points to a network drive or to a UNC path), Windows Explorer does not automatically update the display when file changes or folder changes are made by other users.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
blink blinking flash flickering refresh refreshing reset map mapped networked remote slow performance letter high traffic NotifyChange ChangeNotify directory watch notification NT NOTIFY Watch Tree FILE_NOTIFY_CHANGE_FILE_NAME ReadDirectoryChangesW Shell32.dll ISDN WAN NoRemoteChangeNotify attrib CryptoSignMenu SuppressionPolicy, 200 ms delays, TCP delayed acknowledgement