Knowledge Base

App Request UDP Only, "Netstat -an" Displays TCP and UDP

Article ID: 194171

Article Last Modified on 10/31/2006

Microsoft Windows NT Server 4.0 Standard Edition
Microsoft Windows NT Workstation 4.0 Developer Edition

This article was previously published under Q194171

SYMPTOMS

Winsock applications can specify what UDP ports they listen on. You can use the NETSTAT utility with the -an option to display the status of a socket. However, NETSTAT -an may display both UDP and TCP listening on the same socket when only UDP is bound to the socket.

   NETSTAT [-a] [-n]

    -a  Displays all connections and listening ports. Server-side
        connections are normally not shown.

    -n  Displays addresses and port numbers in numerical form.

CAUSE

This behavior does not affect socket connections, but is simply a display. problem.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0.

Keywords: kbbug kbnetwork kbpending KB194171