0004001500 (user authentication)
This log ID relates to a system event involving user authentication queries.
valid authentication query
Meaning: A valid user authentication query was received.
invalid authentication query
Meaning: An invalid user authentication query was received.
0004001501 (user authentication relay)
This log ID relates to authentication result when the virtual server binds to an authentication policy which uses authentication relay.
[Valid | Invalid] [authentication-relay | kerberos authentication-relay] query
Meaning: An HTTP basic or Kerberos constrained delegation authentication succeeded or failed.