If your proxy offers multiple authentication schemes in 407(Proxy Authentication Required) response, Docker Desktop by default selects Basic authentication scheme. If your proxy server is properly configured for Kerberos or NTLM authentication, you can enable Kerberos/NTLM proxy authentication during Docker Desktop installation. To do that, you will have install Docker Deskop from command line and pass the installer flag '--proxy-enable-kerberosntlm'.