This situation can occur if the authentication is based on protocols such as SPNEGO (WWW-Authenticate: Negotiate), Kerberos, NTLM and if Channel Binding Tokens are utilized.
This behavior is a security feature of the underlying authentication protocol:
If you are managing ESET endpoint products remotely using ESET Security Management Center (or ERA/ECA), apply these settings as a policy.
Disabling this feature will leave your server vulnerable to Man in the Middle attacks and is not recommended. We recommend that you attempt the solution above.
For more information see: