Improper NTFS Permissions May Result in IIS FailureLast reviewed: April 18, 1997Article ID: Q155253 |
The information in this article applies to:
SUMMARYImproper modification of Microsoft Windows NT file system (NTFS) permissions may create an environment where browser clients fail when attempting to access the Microsoft Internet Information Server (IIS) publication services.
MORE INFORMATIONMicrosoft Windows NT version 4.0 installs on a new NTFS partition with change permission for the group Everyone. Improper NTFS access permissions involving other Windows NT accounts such as System, Network, Interactive, and IUSR_ComputerName may affect the operation of IIS. Most of these improperly defined permissions result in a browser client receiving an HTTP response of 401 Access Denied.
As an example, consider an IIS server that has been configured with only Allow Anonymous access in the in WWW Services tab of the Internet Service Manager. The web master has set the following permissions on his or her NTFS WWW publication directory wwwroot of:
CREATOR OWNER Full Control ComputerName\Administrators Full Control IUSR_ComputerName Full Control Everyone No Access System Full ControlThe web master calls Microsoft Product Support, describing an issue in which no one can access his or her IIS server from a WWW client browser. A sniffer trace shows that all of the client browsers receive a 401 Access Denied error message in the HTTP response. The problem is the NTFS permissions. The Web master has allowed the IIS anonymous user account IUSR_ComputerName full access, but the web master has also explicitly denied the group Everyone. The IUSR_ComputerName account belongs to the group Everyone. An explicit deny always takes precedence over an allow, therefore no browser client can access the IIS server. Before contacting Microsoft Product Support Services, customers are encouraged to check the NTFS permissions to verify that any modified access permission is not the cause of improper IIS functionality. For more information on issues related to NTFS permission, please see the following articles in the Microsoft Knowledge Base:
ARTICLE-ID: Q109076 TITLE : Removing Permissions to an NTFS Partition May Prevent Startup ARTICLE-ID: Q130016 TITLE : Removing Everyone On Root Dir. Leaves Limited Virtual Memory ARTICLE-ID: Q137155 TITLE : Users Without System32 Permissions Cannot Log On ARTICLE-ID: Q137400 TITLE : Changing Default Permissions Causes STOP 0xC000021A ARTICLE-ID: Q138923 TITLE : Partitions Displaying as Unknown in Disk Administrator |
Additional query words: prodiis
© 1998 Microsoft Corporation. All rights reserved. Terms of Use. |