DOCUMENT:Q246467 08-MAY-2002 [winnt] TITLE :RAS Server Stops Responding to New PPP Connection Requests PRODUCT :Microsoft Windows NT PROD/VER::4.0 OPER/SYS: KEYWORDS:kbWinNT400PreSP7Fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== A Windows NT 4.0-based server that is running Remote Access Services (RAS) may stop responding to new Point-to-Point protocol (PPP) requests from clients. When this occurs, the server appears to continue servicing existing PPP connections, but no new connections are accepted. This problem occurs only on multiple-processor computers, on which PPP logging is enabled on the server. CAUSE ===== When two threads attempt to write to the PPP log file at the same time, a problem in the kernel may cause the thread that is currently writing to the file to enter a wait state from which it never returns. Because the PPP process cannot proceed until log file write operations have finished, the Rasman.exe process stops responding (hangs), putting the computer into a state in which it cannot accept more PPP connections. RESOLUTION ========== A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English-language version of this fix should have the following file attributes or later: Date Time Size File name Platform -------------------------------------------------------------- 11/18/1999 04:16p 952,896 Ntkrnlmp.exe i386 11/18/1999 04:14p 932,736 Ntoskrnl.exe i386 11/18/1999 04:13p 1,403,968 Ntkrnlmp.exe Alpha 11/18/1999 04:13p 1,375,744 Ntoskrnl.exe Alpha WORKAROUND ========== To work around this problem, disable PPP logging on multiple-processor RAS servers. STATUS ====== Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article. Additional query words: ====================================================================== Keywords : kbWinNT400PreSP7Fix Technology : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 Version : :4.0 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.