System.Security.Cryptography.CryptographicException: Bad Key after installing recent Windows updates

  • Thread starter Hanno Bunjes (hbunjes)
  • Start date
H

Hanno Bunjes (hbunjes)

We are getting reports of certificate operations starting to fail after the Windows Server May 2024 updates.The certificate in question has been working fine for a year.The exception has the following trace:System.Security.Cryptography.CryptographicException: Bad Key.at System.Security.Cryptography.NativeHmac.AppendData(Byte[] data, Int32 offset, Int32 count)at System.Security.Cryptography.HashAlgorithm.ComputeHash(Byte[] buffer)Specifically, uninstalling the following KBs solved the issue immediately:KB5037765KB5037933KB5038283 ***moved from Windows / Windows 10 / Performance and system

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