Can't get kickstar to change mirror host

[Scott Chapman]

I'm doing a net install of 6.06.1 LTS Server.  It's working fairly well but I 
can't get it to tell the installer to go to my local mirror rather than 
us.archive.ubuntu.com.  Can anyone tell me what I'm doing wrong?  I've been 
trying all day yesterday to get this working!  I expect I'm missing something 
obvious.

Here's my ks.cfg file:

#platform=x86
#System language
lang en_US
#Language modules to install
langsupport en_US
#System keyboard
keyboard us
#System mouse
mouse
#System timezone
timezone America/Phoenix
#Root password
rootpw --iscrypted $1$gpRiqS7i$kIVjvD0SD1ZJg6Gu6s7Kf0
#Initial user
user --disabled
#Reboot after installation
reboot
#Use text mode install
text
#Install OS instead of upgrade
install
#This should make it use my local mirror but it doesn't work!
preseed mirror/country string enter information manually
preseed mirror/http/hostname string 192.168.2.50
preseed mirror/http/directory string /dapper
preseed mirror/suite string dapper
preseed mirror/http/proxy string
#System bootloader configuration
bootloader --location=mbr
#Clear the Master Boot Record
zerombr yes
#Partition clearing information
clearpart --all --initlabel
#Disk partitioning information
part swap --size 512
part / --fstype ext3 --size 1 --grow --asprimary
#System authorization infomation
auth  --useshadow  --enablemd5
#Network information
network --bootproto=dhcp --device=eth0
#Firewall configuration
firewall --disabled
#Do not configure the X Window System
skipx
#Package install information
%packages
@ ubuntu-standard
@ openssh-server
@ postgresql-8.2
@ postgresql-client-8.2
@ postgresql-contrib-8.2
@ mysql-server-5.0
@ mysql-client-5.0
@ apache2
@ apache2-mpm-prefork
@ apache2-utils