mrmt went to NOC, and found the server had died due to kernel panic. He resets the machine and it runs back again without any problem. Thanks.

On Sept 13th, 10:00 JST, www.jp.debian.org happened to fall silent, several servers had not responded and we couldn't login via ssh any more. We suspect this is because OOM or disk errors. It also seemed that named also be dead, so that ssh connection won't be established (probably, killed because tcpwrapper recognized the connection from UNKNOWN hosts).

% slogin -v arashi.debian.or.jp
OpenSSH_3.8.1p1 Debian-8.sarge.4, OpenSSL 0.9.7g 11 Apr 2005
debug1: Reading configuration data /home/ukai/.ssh/config
debug1: Applying options for *.debian.or.jp
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to arashi.debian.or.jp [210.157.158.37] port 22.
debug1: Connection established.
debug1: identity file /home/ukai/.ssh/identity type 0
debug1: identity file /home/ukai/.ssh/id_rsa type 1
debug1: identity file /home/ukai/.ssh/id_dsa type 2
ssh_exchange_identification: Connection closed by remote host
zsh: exit 255   slogin -v arashi.debian.or.jp

We're scheduling those who could get to the NOC.