Microsoft KB Archive/232153

= L2TP Session Does Not Disconnect Automatically =

Article ID: 232153

Article Last Modified on 2/26/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Datacenter Server

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This article was previously published under Q232153



SYMPTOMS
If Windows 2000 is configured to use Layer 2 Tunneling Protocol (L2TP) with automatic disconnection enabled, Windows may not drop the L2TP session even when no data is being transferred.



CAUSE
A "keep-alive" mechanism is used by L2TP to differentiate tunnel outages from extended periods of no control or data activity. This is accomplished by injecting "Hello" control messages into the control stream every 60 seconds.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

