求助：Clamd升级出错？

今天在装了clamd以后，手工执行升级，却报错，试了几个小时了，都还是这样：
[root@CentOS clamav]# freshclam
ClamAV update process started at Tue Nov 4 15:56:42 2008
main.cvd is up to date (version: 49, sigs: 437972, f-level: 35, builder: sven)
daily.cvd is up to date (version: 8594, sigs: 20949, f-level: 35, builder: mcichosz)

我的freshclam.conf文件内容如下：

##
## Example config file for freshclam
## Please read the freshclam.conf(5) manual before editing this file.
##

# Comment or remove the line below.
#Example
# Path to the database directory.
# WARNING: It must match clamd.conf's directive!
# Default: hardcoded (depends on installation options)
DatabaseDirectory /var/clamav
# Path to the log file (make sure it has proper permissions)
# Default: disabled
UpdateLogFile /var/log/clamav/freshclam.log
# Maximum size of the log file.
# Value of 0 disables the limit.
# You may use 'M' or 'm' for megabytes (1M = 1m = 1048576 bytes)
# and 'K' or 'k' for kilobytes (1K = 1k = 1024 bytes).
# in bytes just don't use modifiers.
# Default: 1M
#LogFileMaxSize 2M
# Log time with each message.
# Default: no
#LogTime yes
# Enable verbose logging.
# Default: no
#LogVerbose yes
# Use system logger (can work together with UpdateLogFile).
# Default: no
LogSyslog yes
# Specify the type of syslog messages - please refer to 'man syslog'
# for facility names.
# Default: LOG_LOCAL6
#LogFacility LOG_MAIL
# This option allows you to save the process identifier of the daemon
# Default: disabled
#PidFile /var/run/freshclam.pid
# By default when started freshclam drops privileges and switches to the
# "clamav" user. This directive allows you to change the database owner.
# Default: clamav (may depend on installation options)
DatabaseOwner clamav
# Initialize supplementary group access (freshclam must be started by root).
# Default: no
#AllowSupplementaryGroups yes
# Use DNS to verify virus database version. Freshclam uses DNS TXT records
# to verify database and software versions. With this directive you can change
# the database verification domain.
# WARNING: Do not touch it unless you're configuring freshclam to use your
# own database verification domain.
# Default: current.cvd.clamav.net
#DNSDatabaseInfo current.cvd.clamav.net
# Uncomment the following line and replace XY with your country
# code. See http://www.iana.org/cctld/cctld-whois.htm for the full list.
DatabaseMirror db.CN.clamav.net
# database.clamav.net is a round-robin record which points to our most
# reliable mirrors. It's used as a fall back in case db.XY.clamav.net is
# not working. DO NOT TOUCH the following line unless you know what you
# are doing.
DatabaseMirror db.us.clamav.net
DatabaseMirror db.local.clamav.net
# How many attempts to make before giving up.
# Default: 3 (per mirror)
#MaxAttempts 5
# With this option you can control scripted updates. It's highly recommended
# to keep it enabled.
# Default: yes
#ScriptedUpdates yes
# By default freshclam will keep the local databases (.cld) uncompressed to
# make their handling faster. With this option you can enable the compression;
# the change will take effect with the next database update.
# Default: no
#CompressLocalDatabase no
# Number of database checks per day.
# Default: 12 (every two hours)
#Checks 24
# Proxy settings
# Default: disabled
#HTTPProxyServer myproxy.com
#HTTPProxyPort 1234
#HTTPProxyUsername myusername
#HTTPProxyPassword mypass
# If your servers are behind a firewall/proxy which applies User-Agent
# filtering you can use this option to force the use of a different
# User-Agent header.
# Default: clamav/version_number
#HTTPUserAgent SomeUserAgentIdString
# Use aaa.bbb.ccc.ddd as client address for downloading databases. Useful for
# multi-homed systems.
# Default: Use OS'es default outgoing IP address.
#LocalIPAddress aaa.bbb.ccc.ddd
# Send the RELOAD command to clamd.
# Default: no
NotifyClamd /etc/clamd.conf
# Run command after successful database update.
# Default: disabled
#OnUpdateExecute command
# Run command when database update process fails.
# Default: disabled
#OnErrorExecute command
# Run command when freshclam reports outdated version.
# In the command string %v will be replaced by the new version number.
# Default: disabled
#OnOutdatedExecute command
# Don't fork into background.
# Default: no
#Foreground yes
# Enable debug messages in libclamav.
# Default: no
#Debug yes
# Timeout in seconds when connecting to database server.
# Default: 30
#ConnectTimeout 60
# Timeout in seconds when reading from database server.
# Default: 30
#ReceiveTimeout 60
# When enabled freshclam will submit statistics to the ClamAV Project about
# the latest virus detections in your environment. The ClamAV maintainers
# will then use this data to determine what types of malware are the most
# detected in the field and in what geographic area they are.
# This feature requires LogTime and LogFile to be enabled in clamd.conf.
# Default: no
#SubmitDetectionStats /path/to/clamd.conf
# Country of origin of malware/detection statistics (for statistical
# purposes only). The statistics collector at ClamAV.net will look up
# your IP address to determine the geographical origin of the malware
# reported by your installation. If this installation is mainly used to
# scan data which comes from a different location, please enable this
# option and enter a two-letter code (see http://www.iana.org/domains/root/db/)
# of the country of origin.
# Default: disabled
#DetectionStatsCountry country-code


在论坛里面搜了的，好像方法都不能解决我的问题。
还有，我想更换我的clamd的升级服务器，请问是怎样更换呢？