Microsoft KB Archive/159309

= Windows NT 4.0 RAS Not Releasing Static IP Addresses =

Article ID: 159309

Article Last Modified on 11/1/2006

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APPLIES TO


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

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This article was previously published under Q159309



SUMMARY
Windows NT 4.0 RAS clients fail to be assigned an IP address from the RAS server's static address pool. However, there appear to be IP addresses, which should be available.



MORE INFORMATION
Windows NT 4.0 RAS server assigns static IP addresses from a pool to incoming clients, and when they hang up, the addresses are not released.

During regular use, it is observed that, on client hang-up, the IP address assigned to the client is not returned to the IP address pool. This problem is inconsistent and may happen about once in every 10 to 20 connections. The address remains in the routing table. Trying to ping the "lost" IP address results in a "Hardware error" message.

If manually removing the address from the routing table (route delete), it will still not be reused by RAS. Stopping and starting the Remote Access Service does not restore the "lost" addresses to the address pool.



RESOLUTION
Microsoft has confirmed this to be a problem in Windows NT version 4.00. This problem has been corrected in the latest U.S. Service Pack for Windows NT version 4.00. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodnt ras static ip address

Keywords: kbnetwork KB159309

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