XIMS: Chat Service Returns List of All Users When WHO Command Is Sent Without Parameters

ID: q229688

The information in this article applies to:

Microsoft Exchange Server, version 5.5

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore it if a problem occurs. For information about how to do this, view the "Restoring the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key" Help topic in Regedt32.exe.

SUMMARY

If you send the WHO command without any parameters to a Microsoft Exchange Chat Service computer, the server returns a list of all users, although the list may be truncated if it is very long.

MORE INFORMATION

This behavior is by design.

Some system administrators may want the server to return a blank list when the WHO command is sent without any parameters, rather than returning a list of all users.

This feature is available in the latest service pack for Exchange Server version 5.5. For additional information, please see the following article in the Microsoft Knowledge Base:

Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this feature should have the following file attributes or later:

Component: Chat Service

File name	Version
Chatsvc.exe	5.5.2577.0

This feature was first included in Exchange Server 5.5 Service Pack 3. After you obtain this feature, the server can be configured so that it returns a blank list when the WHO command is sent without any parameters. To do so, use the following steps.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys and Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

Start Registry Editor (Regedt32.exe).

Locate the following key in the registry:

HKEY_LOCAL_MACHINE\Software\Microsoft\Exchange\ChatSvc\Parameters

On the Edit menu, click Add Value, and then add the following registry value:

Value Name: RestrictWho
Data Type: REG_DWORD
Value: 1

Quit Registry Editor.

Additional query words:

Keywords : EXC55SP3Fea
Version : winnt:5.5
Platform : winnt
Issue type : kbinfo