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1. CREATE AN ASP.NET WEBSITE USING VISUAL STUDIO COMMUNITY MAC CODE
2. CREATE AN ASP.NET WEBSITE USING VISUAL STUDIO COMMUNITY MAC MAC
3. CREATE AN ASP.NET WEBSITE USING VISUAL STUDIO COMMUNITY MAC WINDOWS

However, because this auto-generated key is local to the computer that created the key, this scenario causes a problem for applications that run in a farm. This auto-generated key is used if there is no explicit element in the application’s configuration. (IExecutionStep step, Boolean& completedSynchronously) +140Ĭause 1: The web application is running in a farm (multi-server environment)ĪSP.NET automatically generates a cryptographic key for each application and stores the key in the HKCU registry hive. Page.ProcessRequest(HttpContext context) +234ĪSP.mypage_aspx.ProcessRequest(HttpContext context) in. Page.ProcessRequestWithNoAssert(HttpContext context) +48 Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +429 Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7959 Page.LoadPageStateFromPersistenceMedium() +368 HiddenFieldPageStatePersister.Load() +444 Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +67 IStateFormatter2.Deserialize(String serializedState, Purpose purpose) +51 ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +861 ViewStateException.ThrowMacValidationError(Exception inner, String persistedState) +46

ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +190 AutoGenerate cannot be used in a cluster. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm.

CREATE AN ASP.NET WEBSITE USING VISUAL STUDIO COMMUNITY MAC MAC

[HttpException (0x80004005): Validation of viewstate MAC failed.

CREATE AN ASP.NET WEBSITE USING VISUAL STUDIO COMMUNITY MAC WINDOWS

User-Agent: Mozilla/5.0 (compatible MSIE 10.0 Windows NT 6.2 WOW64 Trident/6.0) Please review the stack trace for more information about the error and where it originated in the code.Įxception Details: : Validation of viewstate MAC failed. AutoGenerate cannot be used in a cluster.ĭescription: An unhandled exception occurred during the execution of the current web request.

If this application is hosted by a web farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. ASP.NET will detect that a valid MAC hasn't been provided, and ASP.NET will reject the malicious request.Ī MAC validation error will resemble the following example: Because the attacker cannot guess the contents of the element, the attacker cannot provide a valid MAC if the attacker tries to tamper with the _VIEWSTATE payload. The key that is used to calculate the MAC is specified in the application's element in the Web.config file. ASP.NET validates the MAC that is submitted together with the _VIEWSTATE payload when a postback occurs.

CREATE AN ASP.NET WEBSITE USING VISUAL STUDIO COMMUNITY MAC CODE

To prevent this kind of tampering attack, the _VIEWSTATE field is protected by a message authentication code (MAC). If an attacker submitted a malicious _VIEWSTATE payload, the attacker could potentially trick the application into performing an action that it otherwise would not have performed. See the ASP.NET View State Overview topic on the Microsoft Developer Network (MSDN) website for a much more detailed overview of the ASP.NET view state.īecause the _VIEWSTATE field contains important information that is used to reconstruct the page on postback, make sure that an attacker cannot to tamper with this field.

If a user clicks the button, the Button_Click event handler will be able to extract the Button's text from the view state field. One example of an item that might be stored in the _VIEWSTATE field is the text of a Button control. The HTML markup for the _VIEWSTATE field resembles the following: View state is information that is round-tripped between WebForms (.aspx) pages in an ASP.NET application.