I am getting a lot of Smartdefense entries in the logging stating
"Invalid DNS" - Information: Attack Info: Illegal Query Format.

All entries state our Windows NT and - 2000 servers as source.

Smartdefense -> UDP Protocol Enforcement is enabled and I do not want
to disable this setting.

Is this a known issue with Windows NT / 2000 and does anyone know how
this can be fixed?

Best regards,