Dear I have the following problem:
Message:
Unable to validate data.
Trace:
at System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf, Byte[]
modifier, Int32 start, Int32 length, Int32& dataLength) at
System.Web.UI.LosFormatter.Deserialize(String input)
the portal is running months ago and this is the first time this error
generated, why this happening?