I have same problem.I found this how to and it's work.
在CentOS5.2安裝IPAudit - I can't put url address =(
#
# UserDir is disabled by default since it can confirm the presence
# of a username on the system (depending on home directory
# permissions).
# UserDir disable
UserDir enable all
#
# To enable requests to /~user/ to serve the user's public_html
# directory, remove the "UserDir disable" line above, and uncomment
# the following line instead:
#
UserDir public_html
=)
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