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  1. POHtml.AntiForgeryToken() causeing errors after upgrading to .NET 3.5 SP1
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    <p>I've just updated to .NET 3.5 SP1 and my once working ASP.NET MVC page has now stopped working.</p> <p>When trying to load a page I get the following YSOD</p> <pre><code>[CryptographicException: Padding is invalid and cannot be removed.] System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]&amp; outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast) +7596702 System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) +208 System.Security.Cryptography.CryptoStream.FlushFinalBlock() +33 System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo) +225 System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +195 [ViewStateException: Invalid viewstate. Client IP: 127.0.0.1 Port: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6 (.NET CLR 3.5.30729) ViewState: hC6BC8KsuD/yoy2iG74bUZ8TYhGfuDDeIjh9fg/L18yr/E+1Nk/pjS5gyn9O+2jY Referer: http://localhost:1092/admin/product Path: /admin.aspx/product/edit/4193] [HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that &lt;machineKey&gt; configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.] System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +106 System.Web.UI.ViewStateException.ThrowMacValidationError(Exception inner, String persistedState) +14 System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +242 System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +4 System.Web.Mvc.AntiForgeryTokenSerializer.Deserialize(String serializedToken) +73 </code></pre> <p>If I remove the line</p> <pre><code>&lt;%= Html.AntiForgeryToken() %&gt; </code></pre> <p>Everything works again, any ideas what might be causing this? I would have expected more luck in finding a solution if this was an MVC or .NET issue so I'm guess it is something to do with my configuration.</p> <p>I've tried reinstalling the MVC framework to see if it was because I installed before SP1 but I still get the same issue. Google and SO search hasn't resulted in any firm conclusions.</p>
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