The hostname specified in the text mode installer is partialy ignored by the installation - the host just gets localhost.localdomain as 'hostname'. (This is what is put in /etc/sysconfig/network). However the correct name is in /etc/hosts alongside 'localhost.localdomain' and 'localhost'. This was during a text mode server installation.
Basically bug number 16482 in another guise. *** This bug has been marked as a duplicate of 16482 ***
Just to clarify: The hostname from the installer (I use text mode) does not get entered into /etc/sysconfig/network. /etc/sysconfig/network contains 'localhost.localdomain' instead.