System.Web.HttpException: The client disconnected. ---> System.Web.UI.ViewStateException: Invalid viewstate

System.Web.HttpException: The client disconnected. ---> System.Web.UI.ViewStateException: Invalid viewstate. Client IP: Port: 40511 User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729) ViewState: 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

System.Web.HttpException: Unable to validate data. at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) --- End of inner exception stack trace ---
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