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CentOS6のLet'sEncryptのcertbot-autoが途中で止まる

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現象

$ ./certbot-auto
...
Creating virtual environment...
Installing Python packages...

上記になるまでにすごい時間がかかる上、これ以降は動かない。

IPv6が邪魔していた

wgetなどでも時間がかかっていた。
ので、無効化した。

参考:http://www.1x1.jp/blog/2013/03/disable_ipv6_on_centos6.html

$ vi /etc/sysctl.conf 
最後に追記
# ipv6 disable
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1

$ /sbin/sysctl -p
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