I ran an upgrade from 4.0.X to the latest release in our development environment and ran into the following issue.  The upgrade went fine until I tried to log in with various superuser accounts.  None of them would authenticate.  I went to the database and all the accounts were in the database. 

Next I created a new user and made it a superuser in the database.  Logged in and tried to change the passwords for my original superuser accounts.  I get the exception below.  Any ideas?

AssemblyVersion: 04.03.03
PortalID: 0
PortalName: ########
UserID: 19
UserName: Test
ActiveTabID: 34
ActiveTabName: SuperUsers Accounts
RawURL: /Host/Superuser Accounts/tabid/34/ctl/Edit/mid/343/UserId/1/portalid/0/Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://client.trucomply.com/Host/Superuser%20Accounts/tabid/34/ctl/Edit/mid/343/UserId/1/portalid/0/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 8571ce81-80ac-498e-bb2d-c423befba554
InnerException: Bad Data.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Security.Cryptography.CryptographicException.ThrowCryptogaphicException
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Bad Data. ---> System.Security.Cryptography.CryptographicException: Bad Data. at System.Security.Cryptography.CryptographicException.ThrowCryptogaphicException(Int32 hr) at System.Security.Cryptography.Utils._DecryptData(SafeKeyHandle hKey, Byte[] data, Int32 ib, Int32 cb, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode PaddingMode, Boolean fDone) at System.Security.Cryptography.CryptoAPITransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.FlushFinalBlock() at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean useValidationSymAlgo) at System.Web.Security.MembershipProvider.DecryptPassword(Byte[] encodedPassword) at System.Web.Security.MembershipProvider.UnEncodePassword(String pass, Int32 passwordFormat) at System.Web.Security.SqlMembershipProvider.GetPassword(String username, String passwordAnswer) at System.Web.Security.MembershipUser.GetPassword() at DotNetNuke.Security.Membership.AspNetMembershipProvider.ChangePassword(UserInfo user, String oldPassword, String newPassword) at DotNetNuke.Entities.Users.UserController.ChangePassword(UserInfo user, String oldPassword, String newPassword) at DotNetNuke.Modules.Admin.Users.Password.cmdUpdate_Click(Object sender, EventArgs e) at DotNetNuke.UI.WebControls.CommandButton.RaiseImageClick(Object sender, ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

What setting you changed?

After upgrade from 4.3.0 to 4.3.3 I can not login any more.
In development.config or release.config only things that I change were connection string and objectQualifier.

Thanks,
Oliver

Make sure that the new web.config machineKey settings are exactly the same as the settings in the old web.config.  I copied them in incorrectly and that caused my problem.  Essentially I was able to create new users, but none of my existing accounts could log in.  These keys appear to be used to encrypt and decrypt the passwords for accounts.  Thus if you have different settings, the new accounts won't be able to login.  Hope that helps.

<machineKey
        validationKey=""
        decryptionKey=""