DOCUMENT:Q241562 08-MAY-2002 [iis] TITLE :IIS May Permit Clients with an Unresolved IP Address to Connect PRODUCT :Internet Information Server PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbDSupport kbIIS kbfix kbiis400 kbWinNT400PreSP7Fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When using IIS IP and Domain Restrictions to deny clients by a specific domain name, a client with an IP address that IIS cannot resolve will still be allowed to connect. The client may request content over this connection for the duration of the session. If the client makes a request over a different connection, it will be properly denied, and will receive a 403 error that the IP address is not allowed. 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 version of this fix should have the following file attributes or later: Date Time Size File name Platform ------------------------------------------------------------- 09/16/99 12:40PM 322KB asp.dll x86 09/16/99 12:38PM 043KB coadmin.dll x86 09/16/99 12:39PM 011KB ftpctrs2.dll x86 09/16/99 12:39PM 080KB ftpsvc2.dll x86 09/16/99 11:49PM 012KB httpext.h x86 09/16/99 12:38PM 018KB iisadmin.dll x86 09/16/99 12:38PM 062KB iislog.dll x86 09/16/99 12:38PM 017KB infoadmn.dll x86 09/16/99 12:38PM 181KB infocomm.dll x86 09/16/99 12:38PM 029KB iscomlog.dll x86 09/16/99 12:39PM 011KB iwrps.dll x86 09/16/99 12:37PM 070KB metadata.dll x86 09/16/99 12:38PM 051KB nsepm.dll x86 09/16/99 12:39PM 015KB w3ctrs.dll x86 09/16/99 12:39PM 224KB w3svc.dll x86 09/16/99 12:38PM 086KB wam.dll x86 09/16/99 03:40PM 537KB asp.dll alpha 09/16/99 03:38PM 076KB coadmin.dll alpha 09/16/99 03:39PM 017KB ftpctrs2.dll alpha 09/16/99 03:40PM 124KB ftpsvc2.dll alpha 09/16/99 03:40PM 028KB iisadmin.dll alpha 09/16/99 03:40PM 110KB iislog.dll alpha 09/16/99 03:40PM 026KB infoadmn.dll alpha 09/16/99 03:40PM 181KB infocomm.dll alpha 09/16/99 03:40PM 297KB iscomlog.dll alpha 09/16/99 03:40PM 017KB iwrps.dll alpha 09/16/99 03:40PM 129KB metadata.dll alpha 09/16/99 03:40PM 051KB nsepm.dll alpha 09/16/99 03:40PM 021KB w3ctrs.dll alpha 09/16/99 03:40PM 377KB w3svc.dll alpha 09/16/99 03:40PM 146KB wam.dll alpha This hotfix has been posted to the following Internet location as Iprftp4i.exe (x86) and Iprftp4a.exe (Alpha): ftp://ftp.microsoft.com/bussys/iis/iis-public/fixes/usa/IIS40/hotfixes-postSP6/security/IPRFTP-fix/ STATUS ====== Microsoft has confirmed this to be a problem in Internet Information Server 4.0. MORE INFORMATION ================ For related information on this problem, please visit the following Microsoft Web site: http://www.microsoft.com/security/bulletins/ For additional security-related information about Microsoft products, please visit the following Microsoft Web site: http://www.microsoft.com/security/ Additional query words: ====================================================================== Keywords : kbDSupport kbIIS kbfix kbiis400 kbWinNT400PreSP7Fix Technology : kbiisSearch kbiis400 Version : winnt: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.