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If the Integrated Windows Authentication option, formerly known as NT LAN Manager or NTLM and Windows NT Challenge/Response authentication, is selected, the browser attempts to use the current user s credentials from a domain login If that fails, a login prompt appears This isn t a very attractive login prompt, and the developer has no control over it Remember, as long as you disable Anonymous Access, any of these authenticated access methods will allow your application to determine the user name for any page requested The IP Address And Domain Name Restrictions section of the Directory Security tab of the Properties dialog box (Figure A-5) contains an Edit button that allows you to control IP address and domain name restrictions.

Applications that have different debugging, staging, and release environments typically have different application settings as well. For example, during debugging, an application might use a local file system database. However, in the production environment, the application might connect to a central database running Microsoft SQL Server.

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Web.config transformations allow you to create separate Web.config files for different release types. Therefore, you can create debugging, staging, and release versions of the Web.config file with settings specific to each release type. To simplify management, you only need to specify settings that must be added, changed, or removed from the base Web.config file. By default, Visual Studio adds Web.config transformations for the Debug and Release configurations for new ASP.NET Web Application projects. You can view and edit the transformations from Solution Explorer by expanding the Web.Config node and then double-clicking either Web.Debug.Config or Web.Release.Config. If you add more configurations (such as a staging configuration), you can add an associated transformation by right-clicking Web.config in Solution Explorer and then clicking Add Config Transformations. The sections that follow describe the syntax for adding, replacing, and removing settings. For detailed information about more complex transformations, read Web.config Transformation Syntax for Web Application Project Deployment at http://msdn.microsoft.com/en-us/library /dd465326.aspx.

There are two types of remote access:

Web.config transformations contain only those settings that should be different from the standard Web.config file. To add a new setting to a Web.config file that is generated when publishing a web application, simply add the setting to the Web.config transformation file. For example, defining the following Web.Release.Config file will add the connection string to the Web.config file when you publish the web application by using the Release setting:

<configuration> <connectionStrings> <add name="MyDatabase" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\mydb.mdf;User Instance=true" providerName="System.Data.SqlClient" /> </connectionStrings> </configuration>

These sorts of restrictions are seldom used, but they can be effective in some intranet applications by allowing you to specify a subnet mask to control IP addresses allowed or disallowed into the application The Server Certificate, View Certificate, and Edit buttons in the Secure Communications section of the Directory Security tab can be used to set up a security certificate to allow Secure Sockets Layer (SSL) communications The MSDN documentation (especially the IIS Resource Kit) contains much more information on these options The last two tabs in the Properties dialog box, HTTP Headers and Custom Errors, aren t terribly interesting As their names suggest, they allow you to control HTTP headers and custom errors By configuring the Custom Errors tab, you can set up error handling pages for any of the standard HTTP errors such as a 400 error, resource not found.

the network is doing so in a way that makes it appear to be virtually on the network. In other words, it s operating consistent with VPN using L2TP/IPSec or PPTP.

If you need to define different settings for the same value in your base Web.config file and in a Web.config transformation, add the element to the Web.config transformation and specify the xdt:Transform="Replace" property. Any settings defined within the element will replace those in the base Web.config file when your web application is published. For example, to replace the settings for custom errors so that the release version of your web application does not display detailed error information to remote users, you could add the following code to the Web.Release.Config file. Notice the xdt:Transform property in bold.

<configuration> <system.web> <customErrors defaultRedirect="GenericError.htm" mode="RemoteOnly" xdt:Transform="Replace"> <error statusCode="500" redirect="InternalError.htm"/> </customErrors> </system.web> </configuration>

You can use the xdt:Locator property to selectively replace settings when a property matches a specified value. Set the value of xdt:Locator to a conditional method call. For example, to verify that one of the properties you specify must match the property in the base Web.config file, use the Match method. The following example would replace an <add> connection string element only if the name property matched exactly.

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<configuration> <connectionStrings> <add name="MyDB" connectionString="Data Source=ReleaseSQLServer; Initial Catalog=MyReleaseDB;Integrated Security=True" xdt:Transform="SetAttributes" xdt:Locator="Match(name)"/> </connectionStrings> </configuration>

The Configuration button on the Directory tab of the AppendixA Properties dialog box (Figure A-3) allows you to control certain aspects of the application as well as troubleshoot problems with an ASPNET installation When you click Configuration, the Application Configuration dialog box appears, as shown in Figure A-7..

If you were to remove the xdt:Locator property, the Web.config transformation would replace all connection strings.

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