If you disable user identification on the public wifi zone you will lose User-ID visibility within that zone but that won't necessarily stop the agent from attempting to enumerate systems within that zone. You can either implement a security policy rule to deny/drop User-ID agent traffic to this zone or you could simply exempt the IP address for this system within the IP exemption list within the User-ID agent as seen here.
Is the "victim" host a domain controller or other Windows server which the Agent would attempt to access to enumerate users? I suspect this is normal behavior yet there could be underlying login issues between the DC and 10.4.190.66 (victim). If 10.4.190.66 is not needed for enumeration purposes you could add it to the IP exemption list within the Agent.
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