Microsoft KB Archive/153161

= Windows NT Systems Running RAS May Exhaust Available DHCP Leases =

Article ID: 153161

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * 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 Q153161



SYMPTOMS
A RAS service configured to use dynamic host configuration protocol (DHCP) to allocate IP addresses for dial-up clients may acquire more IP address leases than needed, thereby depleting available addresses.

The leased addresses are indicated by a telephone icon in the Active Leases window of DHCP Manager.

This problem can occur when portable computer users on the network who have installed RAS and configured it for dialing out and receiving calls start their systems on and off the network.



CAUSE
During initialization, the RAS service acquires new leases because it fails to read information regarding previously acquired leases. The previously leased addresses, now orphaned, will only be returned to the pool of available addresses when their leases expire.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Additional query words: leak remote access

Keywords: kbhotfixserver kbqfe kbbug kbfix KB153161

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