Error changing machineKey

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9/30/2010 7:57:15 AM

Aaron W

Total Posts 115

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Error changing machineKey

Windows Server 2008R2
SQL 2008R2
2.3.5.3
ASP.Net 4

Working with a fresh install of Mojo everything is works until I change the machineKey. When the default admin or a new user tries to login the site throws the following message

2010-09-30 08:46:14,126 ERROR mojoPortal.Web.Global - 74.218.166.234-en-US - /Secure/Register.aspx
System.Web.HttpException (0x80004005): Unable to validate data.
   at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean useValidationSymAlgo, Boolean useLegacyMode, IVType ivType, Boolean signData)
   at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Boolean useValidationSymAlgo, Boolean useLegacyMode, IVType ivType)
   at System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket)
   at mojoPortal.Web.mojoRoleProvider.GetRolesFromCookie()
   at mojoPortal.Web.mojoRoleProvider.GetRolesForUser(String userName)
   at System.Web.Security.RolePrincipal.IsInRole(String role)
   at mojoPortal.Business.WebHelpers.WebUser.IsInRole(String role)
   at mojoPortal.Web.UI.AnalyticsAsyncTopScript.DoInit()
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Control.InitRecursive(Control namingContainer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

If I put the default machineKey back in everything works. I used IIS manager to generate the key and the passwords are set to the default of clear text.

9/30/2010 8:10:13 AM

Joe Audette

Total Posts 18439

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Re: Error changing machineKey

If its a new install, then I would change the machine key, clear the browser cookies before you login, and that should solve it. I actually added error handling there for an error I got with this during testing, but I was getting a cryptography exception, I'm kind of surprised it would throw a more general httpexception there. Is this after installing the new security update patches form Microsoft? I wonder if the update changed the error. I will add logic to catch this httpexception.

Best,

Joe

9/30/2010 8:10:58 AM

Aaron W

Total Posts 115

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Re: Error changing machineKey

Thanks Joe. Clearing the browser cache did work. But yes the updates from MS have been applied to the server.

9/30/2010 8:13:38 AM

Joe Audette

Total Posts 18439

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Re: Error changing machineKey

So my guess is that part of their fix was to not throw CryptographicException when decryption errors occur, but instead throw a more generic httpexception.

Best,

Joe

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