No servidor do Active Directory, os usuários que usam para fazer logon com você encontrarão uma entrada no log de eventos de segurança.
O ID do Evento pode ser 4771 (Serviço de Autenticação do Kerberos)
Pode parecer semelhante à seguinte entrada:
Kerberos pre-authentication failed.
Account Information:
Security ID: DOMAIN/USERACCOUNT
Account Name: USERACCOUNT
Service Information:
Service Name: krbtgt/DOMAIN
Network Information:
Client Address: ::ffff: **172.17.xx.xx**
Client Port: 59596
Additional Information:
Ticket Options: 0x40810010
Failure Code: 0x18
Pre-Authentication Type: 2
Certificate Information:
Certificate Issuer Name:
Certificate Serial Number:
Certificate Thumbprint:
Certificate information is only provided if a certificate was used for pre-authentication.
Pre-authentication types, ticket options and failure codes are defined in RFC 4120.
If the ticket was malformed or damaged during transit and could not be decrypted, then many fields in this event might not be present.
A linha Endereço do Cliente informará de qual cliente / servidor a tentativa de logon veio. (neste exemplo 172.17.xx.xx)