Squeeze apt source list - Shammer's Philosophy

I use Debian Squeeze as my test server default destribution.
But, recently, squeeze apt is not good. My /etc/apt/sources.list is like below.

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# cat /etc/apt/sources.list
#
# /etc/apt/sources.list
#

#
# squeeze
#
deb http://ftp.jp.debian.org/debian/ squeeze main contrib non-free
deb-src http://ftp.jp.debian.org/debian/ squeeze main contrib non-free

#
# Security updates
#
deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free

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According to Debian JP Project - ミラーサイトについて, there is a command named apt-spy,
this rewrites /etc/apt/sources.list, so I tried, but not installed in my environments.
And apt-get tried to connect invalid(not responsed) server.

And I tried LTS/Using - Debian Wiki, but there are some servers not to be connected.

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# cat /etc/apt/sources.list
#
# /etc/apt/sources.list
#
deb http://http.debian.net/debian/ squeeze-lts main contrib non-free
deb-src http://http.debian.net/debian/ squeeze-lts main contrib non-free

#
# squeeze
#
deb http://http.debian.net/debian/ squeeze main contrib non-free
deb-src http://http.debian.net/debian/ squeeze main contrib non-free

#
# Security updates
#
#deb http://security.debian.org/ squeeze/updates main contrib non-free
#deb-src http://security.debian.org/ squeeze/updates main contrib non-free

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I have to consider to upgrade wheezy from squeeze.