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Specifies the behavior for checking channel binding information. The tokenChecking attribute can be one of the values in the next table. The flags attribute configures additional behavior for extended protection. The possible flags are as follows. This flag specifies that no additional behavior is enabled for extended protection.

The numeric value is 0. This flag specifies that part of the communication path will be through a proxy, or the client is connecting directly to the destination server over HTTP. The numeric value is 1. This flag specifies that SPN checking is disabled. This flag should not be used in scenarios where only SPNs are being checked. The numeric value is 2.

Note Setting this flag is not a secure scenario, as non-FQDN based names are vulnerable to name resolution poisoning attacks. This setting is not recommended as it may expose customers to risk. The numeric value is 4. This flag specifies that the client-to-server communication path will use HTTP only.

Note When you specify this flag, you must also specify the Proxy flag. The numeric value is The tokenChecking attribute configures the behavior for checking for channel binding tokens. The possible values for this attribute are as follows. This value specifies that IIS will not perform channel binding token checking.

This setting emulates the behavior that existed before extended protection. This value specifies that channel binding token checking is enabled but not required.

This setting allows communications with clients that support extended protection to be protected by the feature, but still supports clients that cannot use extended protection. This value specifies that channel binding token checking is required. This setting does not provide support for clients that do not support extended protection. The following examples demonstrate how to enable Windows authentication with extended protection for the Default Web Site and how to add two SPNs to the collection.

This setting commits the configuration settings to the appropriate location section in the ApplicationHost. Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly.

Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:.

This setting allows communications with clients that support extended protection to be protected by the feature, but it still supports clients that cannot use extended protection The numeric value is 1.

For example, no proxy server is being used. This flag specifies that part of the communication path will be through a proxy. This flag should not be used in scenarios in which only SPNs are being checked. Turn on this bit also if both secure and nonsecure traffic that is sent through the proxy has to be successfully authenticated.

Start Registry Editor. To do this, click Start , click Run , type regedit, and then click OK. Verify that the tokenChecking , Flags , and spns registry values are present. If these registry values are not present, follow these steps to create them:. In the Value data box, type the preferred value, and then click OK. In the Value data box, enter an appropriate spn, and then click OK. For more information about the Extended Protection for Authentication feature and about how to enable this feature upon installing this update, visit the following Microsoft Web site:.

There are some cases in which some Service Pack 1 SP1 binaries may be installed on a computer that is otherwise running SP2. Installing this update on such a computer can cause an IIS failure, which causes the server to return " Service Unavailable" error messages for all requests.

To determine whether the server is running the correct SP2 binaries for IIS, refer to the following file table to verify that version numbers are equal to the versions of the files listed here or to later versions. Windows Server This update was rereleased on March 9, to perform an additional check to make sure that the IIS 6 system on a computer that is running Windows Server SP2 does not contain binaries from the SP1 version. If such binaries are found, this update will exit with an error message.

To fix this condition, reapply the SP2 update to your computers and install this package after you successfully reinstall SP2. The System log would display the following error message when the IIS service is started:. The process id was ''. For more information about this known issue, click the following article number to view the article in the Microsoft Knowledge Base:. As of December 16, , if you use Automatic Updates, you will no longer be offered this update if your IIS installation is in a configuration where both SP1 and SP2 binaries are present on the computer.

We recommend that you review the following article in the Microsoft Knowledge Base for the next steps that you must take to make sure that the computer is ready to apply this update. This re-released update fully replaces the initial release. If you install the new release, the initial release will be uninstalled and replaced by the new one.

Uninstalling the March 9 release of this update will leave the computer without Extended Protection for IIS functionality present. The English United States version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time DST bias.

Additionally, the dates and times may change when you perform certain operations on the files. GDR service branches contain only those fixes that are widely released to address widespread, critical issues. QFE service branches contain hotfixes in addition to widely released fixes. In addition to the files that are listed in these tables, this software update also installs an associated security catalog file KB number.

Service Pack 1 is integrated into the release version of Windows Server RTM milestone files have a 6. LDR service branches contain hotfixes in addition to widely released fixes. The security catalog files attributes not listed are signed with a Microsoft digital signature. Note On March 9, , this update was rereleased to address an installation issue and a functional issue: This update will now correctly detect when a computer that is running Windows Server Service Pack 2 SP2 is in an installation where IIS 6 contains some Windows Server Service Pack 1 SP1 binaries, and will refuse to install and exits with an error code.

More Information Configuration Extended protection enhances the existing Windows Authentication functionality to mitigate authentication relay or "man in the middle" attacks. This mitigation is accomplished by using security information that is implemented through two security mechanisms: Channel binding information that is specified through a Channel Binding Token CBT.

Extended Protection Scenarios Consider the following sample scenarios. Proxy, ProxyCohosting SPN checking will be used, and channel binding token checking will not be used. Client connects directly to destination server that uses SSL. None Channel binding token checking is used, and SPN checking is not used.

Client connects to destination server through a proxy server that uses HTTP for the path. Client connects to destination server through a proxy server that uses SSL for the path.

IIS administrators often monitor IIS log files manually or programmatically, watching for server errors or suspicious client activity. The log files that are created by the IIS logging modules are easy to read manually, however the following methods can be used to monitor IIS log files programmatically. Log Parser 2. Log Parser is available as a command-line tool and as a set of scriptable COM objects.

LogParser can be downloaded from the Microsoft Download Center. With ASP. NET to display and manipulate data from supported data sources such as a database. Then, to display your data in a formatted, customizable manner, bind the data to a server control such as the GridView , DataGrid , or Table control. NET 2. This component allows you to quickly create, for example, ASP scripts or VB components that programmatically walk through daily log files so that certain types of information can be extracted.

The IIS logging component is deprecated. IIS 6. Skip to main content.