Sun Java System Web Server 6.1 SP12 Administrator's Guide

Default Virtual Server

URL-Host-based virtual servers are selected using the Host request header. If the end user’s browser does not send the Host header, or if the server cannot find the specified Host header, the default virtual server services the request.

The default virtual server is set by listen socket. You specify a default virtual server when you create a listen socket. You can always change the default virtual server.