Server System Variables SET_VAR  Hint Applies No Type String Default Value TLSv1,TLSv1.1,TLSv1.2,TLSv1.3  (OpenSSL 1.1.1 and higher) TLSv1,TLSv1.1,TLSv1.2  (otherwise) The  admin_tls_version  system variable is like  tls_version , except that it applies to the administrative connection interface rather than the main connection interface. For information about configuring encryption support for the administrative interface, see Administrative Interface Support for Encrypted Connections. Note As of MySQL 8.0.26, the TLSv1 and TLSv1.1 connection protocols are deprecated and support for them is subject to removal in a future version of MySQL. See Deprecated TLS Protocols. Command-Line Format --authentication-windows-log-level=# System Variable authentication_windows_log_level Scope Global Dynamic No SET_VAR  Hint Applies No Type Integer Default Value 2 Minimum Value 0 Maximum Value 4 This variable is available only if the  authentication_windows  Windows authentication plugin is enabled and debugging code is enabled. See Section 6.4.1.6, “Windows Pluggable Authentication” . This variable sets the logging level for the Windows authentication plugin. The following table shows the permitted values. Value Description 0 No logging 1 Log only error messages 2 Log level 1 messages and warning messages 3 Log level 2 messages and information notes 4 Log level 3 messages and debug messages • authentication_windows_use_principal_name Command-Line Format --authentication-windows-use- principal-name[={OFF|ON}] System Variable authentication_windows_use_principal_name 768 • authentication_windows_log_level