[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean useValidationSymAlgo, Boolean useLegacyMode, IVType ivType, Boolean signData) +1067
System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket) +307
DotNetNuke.Services.Syndication.RssHttpHandlerHelper.ParseChannelQueryString(HttpRequest request, String& channelName, String& userName) +116
DotNetNuke.Services.Syndication.RssHttpHandlerBase`3.System.Web.IHttpHandler.ProcessRequest(HttpContext context) +69
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +195
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +50
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +73
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