Security Validation and Authentication Failures

This counter is incremented whenever a message is rejected due to a security problem not covered by the "Security Calls Not Authorized" counter. Such problems include:

• Client token cannot be read from the message.
  
  
• Client token has failed authentication (for example, bad password).
  
  
• Signature verification has failed (for example, the message has been tampered).
  
  
• The message is a duplicate from a previous one, which can happen during a replay attack.
  
  
• A decryption failure has occurred.
  
  
• Some required elements (for example, missing timestamp or encrypted data block) are missing from the message.
  
  
• Errors have occurred during TLSNEGO/SPNEGO handshake.