SMS: Simultaneous Attempts to Remote Control May Cause Errors

CAUSE

Windows NT Server Remote Control allows only one computer running Systems Management Server to control the client at a time. If multiple computers running Systems Management Server attempt to control the client, Wuser32.exe initially accepts the connections, starts to verify permissions, and then disconnects the additional Systems Management Server connections because it is already being controlled.

When a Systems Management Server connection is disconnected, Wuser32.exe parses through a list of security contexts held for Systems Management Server connections. If a security context has been inactive in the list for more than one minute, Wuser32.exe frees the context.

When the Systems Management Server administrator that currently has control of the workstation attempts to perform a remote task in the "Quick Windows Viewer", Wuser32.exe on the client computer running Windows NT Workstation looks up the security context for that Systems Management Server connection to verify permissions. If the Systems Management Server administrator's security context was freed during the connection termination of another computer running Systems Management Server, Wuser32.exe passes an invalid security context to Windows NT Server. The invalid security context causes Wuser32.exe to cause an access violation (AV) and the "Quick Windows Viewer" will appear to stop responding.