All authentication security packages are disabled, so a message containing authentication information was dropped. Cause: ...

All authentication security packages are disabled, so a message containing authentication information was dropped.

Cause: This could happen if only Kerberos is configured and the server receives an unauthenticated request from a remote user.
Resolution:
To allow authentication negotiation, at least one authentication protocol must be enabled. If Outside User Access is allowed, ensure that NTLM protocol is also enabled.