DOCUMENT:Q188903 15-JUL-1999 [iis] TITLE :Event Viewer Does Not Show IUSR_machinename Account Logon PRODUCT :Internet Information Server PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When troubleshooting Internet Information Server (IIS) permission problems, it is often useful to turn on Windows NT auditing for successful and failed logon/logoff events, as suggested by the following article in the Microsoft Knowledge Base: Q185874 : How to Troubleshoot Permissions in IIS 4.0 However, sometimes you may not see the IUSR_machinename account being logged on to the system when using anonymous access. CAUSE ===== This is a result of the account used for anonymous access being cached by IIS for a short period. If the account is re-used before this period has elapsed, the account is not logged on again, but instead the cached token is used and no event is shown in the event viewer. WORKAROUND ========== To record each time the IUSR_machinename account is logged on and off, you can disable the IIS caching of the anonymous user account by setting the PasswordCacheTTL ASO property to zero. The following sample code can be called from Visual Basic, ASP, and Windows Script Host with minimal changes in each environment and will affect all Web server instances: Dim oServer Set oServer = GetObject("IIS://LocalHost/W3SVC") oServer.PasswordCacheTTL = 0 oServer.SetInfo Set oServer = Nothing Please note: There is a performance tradeoff while doing this. The procedure should be restricted to development and debugging only. Additional query words: ====================================================================== Keywords : Technology : kbiisSearch kbiis400 Version : winnt:4.0 Issue type : kbprb ============================================================================= 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 1999.