NET 4 might be different than the information returned in an earlier version of ASP. For both scenarios, it is recommended that you also manually delete the system.codedom section, although this is not required. NET 4 applications that are configured as children of applications that run earlier versions of ASP. The types were moved in order to resolve architectural layering dependencies between types in the client and in extended . Web site projects do not have problems as a result of moving these types, because System. Application was added to the list of referenced assemblies that is used by default by the ASP. If you upgrade a Web site project that was created using an earlier version of ASP. NET 4 by opening it in Visual Studio 2010, the project will compile without errors. Therefore, upgraded Web application projects will also compile without errors. This had the effect of telling client browsers to never cache the page locally. NET, and bug reports suggest that developers are unaware of the existing Set Omit Vary Star behavior. NET 4, the decision was made to fix the root problem. assembly, add a reference to this assembly to either the root file. NET provides a certain level of default protection against cross-site scripting (XSS) attacks. Request validation is also active when custom HTTP modules are reading the contents of an HTTP request. Your applications might be affected if you run mixed ASP. NET 4 environments where data such as forms authentication cookies must work across. Because of the complexity of the managed IIS 7 and IIS 7.5 configuration systems, running ASP. NET 4 and under IIS 7 and IIS 7.5 can result in either ASP. This causes a mismatch between the abbreviated configuration section in application-level file. NET 4 configuration system throws a configuration error. As a result, request validation applies to requests for all ASP. This includes requests such as Web service calls and custom HTTP handlers. NET 4 Web application to use the older HMACSHA1 algorithm, add the following setting in the files. However, manually modified application-level file entries that do not precisely match the original boilerplate configuration section definitions that were introduced with Visual Studio 2008 will cause ASP. (The default configuration entries that are generated by Visual Studio 2008 work correctly.) A common problem is that manually modified files leave out the allow Definition and require Permission configuration attributes that are found on various configuration section definitions.
In this configuration, the IIS 7 configuration system incorrectly merges an application's managed configuration by comparing the application-level files from the .
Windows Vista SP1 or Windows Server 2008 SP1, where neither hotfix KB958854 nor SP2 are installed.
In that case, you might have to manually modify the application's file before you run the application under the . The next two sections describe changes that you might need to make for different combinations of software.
This document describes changes that have been made for the . NET 4 Web Sites Fail to Start on Computers Where Share Point Is Installed The Http Request. NET, the default behavior was equivalent to the Auto ID setting of Client IDMode. If you use Visual Studio 2010 to upgrade your application from ASP. NET 3.5, the tool automatically adds a setting to the file that preserves the behavior of earlier versions of the . However, if you upgrade an application by changing the application pool in IIS to target the . NET 4 and will reject more instances of invalid markup. Notice the unclosed style attribute that runs into the Css Class attribute. In this scenario, the IIS 7 and IIS 7.5 native configuration system returns a configuration error because it performs a text comparison on the type attribute that is defined for a managed configuration section handler.
NET Framework version 4 release that can potentially affect applications that were created using earlier releases, including the ASP. Download This Whitepaper Control Rendering Compatibility Version Setting in the Web.config File Client IDMode Changes Html Encode and Url Encode Now Encode Single Quotation Marks ASP. NET Request Validation Default Hashing Algorithm Is Now HMACSHA256 Configuration Errors Related to New ASP. NET 4 Child Applications Fail to Start When Under ASP. File Path Property No Longer Includes Path Info Values ASP. For example, the following two snippets would successfully parse in earlier releases of ASP. The browser definition files have been updated to include information about new and updated browsers and devices. Because all files that are generated by Visual Studio 2008 and Visual Studio 2008 SP1 have "3.5" in the type string for the extensions (and related) configuration section handlers, and because the ASP.
NET Page (.aspx) Parser is Stricter Browser Definition Files Updated System. NET 2.0 Applications Might Generate Http Exception Errors that Reference Event Handlers Might Not Be Not Raised in a Default Document in IIS 7 or IIS 7.5 Integrated Mode Changes to the ASP. If you use Visual Studio 2010 to upgrade your application from ASP. NET 3.5, the tool automatically adds a setting to the file that preserves legacy rendering. To disable the new rendering mode, add the following setting in the The Client IDMode setting in ASP. Older browsers and devices such as Netscape Navigator have been removed, and newer browsers and devices such as Google Chrome and Apple i Phone have been added. assembly was included in the root file in the assemblies section under . NET 4 file has "4.0" in the type attribute for the same configuration section handlers, applications that are generated in Visual Studio 2008 or Visual Studio 2008 SP1 always fail configuration validation in IIS 7 and IIS 7.5.NET Code Access Security (CAS) Implementation Membership User and Other Types in the System. Security Namespace Have Been Moved Output Caching Changes to Vary * HTTP Header System. Security Types for Passport are Obsolete The Menu Item. Dynamic Pop Out Image Url Fail to Render Images When Paths Contain Backslashes Disclaimer ASP. NET Framework version 4 in order to let you specify more precisely how they render markup. NET Framework, some controls emitted markup that you had no way to disable. However, if you upgrade an application by changing the application pool in IIS to target the . If your application contains custom browser definitions that inherit from one of the browser definitions that have been removed, you will see an error. In order to improve performance, the reference to this assembly was removed. The workaround for the first scenario is to update the application-level file that was generated automatically by Visual Studio 2008.Pop Out Image Url Property Fails to Render an Image in ASP. For example, if the Note The Http Browser Capabilities object (which is exposed by the page’s Request. This download includes the old browser definition files, the new browser definition files, and instructions for installing the files. An alternative workaround for the first scenario is to install Service Pack 2 for Vista or Windows Server 2008 on your computer or to install hotfix KB958854 ( to fix the incorrect configuration-merge behavior of the IIS configuration system. Set Omit Vary Star method was added, which you could call to suppress the header. To disable the new client ID mode, add the following setting in the files) is stricter in ASP. As a result, request validation errors might now occur for requests that previously did not trigger errors. NET 2.0 request validation feature, add the following setting in the However, we recommend that you analyze any request validation errors to determine whether existing handlers, modules, or other custom code accesses potentially unsafe HTTP inputs that could be XSS attack vectors. NET uses both encryption and hashing algorithms to help secure data such as forms authentication cookies and view state. NET 4 now uses the HMACSHA256 algorithm for hash operations on cookies and view state. Windows Vista SP2, Windows Server 2008 SP2, Windows 7, Windows Server 2008 R2, and also Windows Vista SP1 and Windows Server 2008 SP1 where hotfix KB958854 is installed.Browser property) is driven by the browser definitions files. After you copy the files, run the Aspnet_command-line tool. However, after you perform either of these actions, your application will likely encounter a configuration error due to the issue described for the second scenario. This method was chosen because changing the emitted HTTP header was considered a potentially breaking change at the time.Therefore, the information returned by accessing a property of this object in ASP. The workaround for the second scenario is to delete or comment out all the extensions configuration section definitions and configuration section group definitions from the application-level file and can be identified by the config Sections element and its children. However, developers have been confused by the behavior in ASP.