Under linux, if hostname cannot be resolved (i.e. no IP address can be found) then setup fails and the following stacktrace is shown:
java.net.UnknownHostException: wildfire: wildfire
at java.net.InetAddress.getLocalHost(Unknown Source)
at org.jivesoftware.wildfire.admin.setup.setup_002dhost_002dsettings_jsp._jspService(setup_002dhost_002dsettings_jsp.java:132)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)