[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo, Boolean signData) +1008
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo) +91
System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket) +246
DotNetNuke.Services.Syndication.RssHttpHandlerHelper.ParseChannelQueryString(HttpRequest request, String& channelName, String& userName) +110
DotNetNuke.Services.Syndication.RssHttpHandlerBase`3.System.Web.IHttpHandler.ProcessRequest(HttpContext context) +66
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
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