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Microsoft KB Archive/172290

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Knowledge Base

Routing and Remote Access "Out of Buffers" event logs

Article ID: 172290

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Server 4.0, Terminal Server Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0

This article was previously published under Q172290


Your Windows NT Routing and Remote Access (RRAS) server may start dropping calls randomly. The event log on the RRAS server may contain one or more of the following event log messages:

Event ID: 20073
Source: Router
Description: The following error occurred in the Point to Point Protocol module on port COM1. Out of Buffers.


Event ID: 20095
Source: Router
Description: Cannot receive initial data on port COM1 because of the following error: Out of Buffers.


Event ID: 20111
Source: Router
Description: A Demand Dial connection to the remote interface <name> on port COM1 was successfully initiated but failed to complete successfully because of the following error: Out of buffers.

Your Remote Access Service (RAS) or Dial-Up Networking (DUN) clients may receive one or more of the following errors:

Error 629: The port was disconnected by the remote machine.


Error 731: Dial-Up Networking could not negotiate a compatible set of network protocols you specified in the Server Type settings. Check your network configuration in the Control Panel then try the connection again.


To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For more 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


Microsoft has confirmed this to be a problem in Routing and Remote Access Update for Windows NT Server version 4.0. This problem was corrected in the latest Routing & Remote Access Service Hotfix Update. You can obtain this update from Microsoft's World Wide Web Site on the Internet at the following location:

NOTE: Because the Microsoft Web site is regularly updated, the site address may change without notice. If this occurs, link to the Microsoft home page at the following address:

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: 4.00

Keywords: kbhotfixserver kbqfe kbbug kberrmsg kbfix kbnetwork kbwinnt400sp4fix KB172290