The agent requires authentication for this emake client connection.
If an emake client connects to an agent that requires authentication, but does not attempt authentication, then it receives this error.
An attacker could attempt to use the agent without authentication. If that attempt succeeded, then the attacker could predict the absence of this message. If it failed, then the attacker could reasonably predict that this message would issue. Thus, this message provides no additional information to an attacker.
See description above.
Enable authentication on the emake client.