This indicates a possible exploit of a denial of service vulnerability in Microsoft Windows.
An attacker can send a specially crafted RPC request to the server, causing it to crash. The server must be restarted to regain normal functionality.
MicrosoftWindows 2000 any version.
Microsoft Windows 2003 Server.
MicrosoftWindows NT any version.
Denial of service.
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS01-041.