After you upgrade from Microsoft ASP.NET 1.1 to Microsoft ASP.NET 2.0, some ASP.NET-based applications may not function correctly. Additionally, when you access ASP.NET Web pages that have ViewState enabled, you may receive the following error message:
[InvalidOperationException: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms.]
System.Security.Cryptography.RijndaelManaged..ctor() +200 System.Web.Configuration.MachineKeySection.ConfigureEncryptionObject() +2088
System.Web.Configuration.MachineKeySection.EnsureConfig() +904
System.Web.Configuration.MachineKeySection.GetEncodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32& length) +88
System.Web.UI.ObjectStateFormatter.Serialize(Object stateGraph) +1320
System.Web.UI.Util.SerializeWithAssert(IStateFormatter formatter, Object stateGraph) +248
System.Web.UI.HiddenFieldPageStatePersister.Save() +280
System.Web.UI.Page.SaveAllState() +6488
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +17240
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Version Information: Microsoft .NET Framework Version:2.0.50606.0; ASP.NET Version:2.0.50606.0