我的 ntp.conf 文件：
user@pc[0][07:37:40]:/etc$ cat /etc/ntp.conf
idriftfile /var/lib/ntp/ntp.drift
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
server pool.ntp.org
命令输出：
user@pc[0][07:37:24]:/etc$ sudo ntpdate -dv pool.ntp.org
18 Jun 07:37:35 ntpdate[10737]: ntpdate 4.2.4p8@1.1612-o Tue Apr 19 07:15:05 UTC 2011 (1)
Looking for host pool.ntp.org and service ntp
host found : conquest.kjsl.com
transmit(198.137.202.16)
transmit(216.45.57.38)
transmit(64.6.144.6)
transmit(198.137.202.16)
transmit(216.45.57.38)
transmit(64.6.144.6)
transmit(198.137.202.16)
transmit(216.45.57.38)
transmit(64.6.144.6)
transmit(198.137.202.16)
transmit(216.45.57.38)
transmit(64.6.144.6)
transmit(198.137.202.16)
transmit(216.45.57.38)
transmit(64.6.144.6)
198.137.202.16: Server dropped: no data
216.45.57.38: Server dropped: no data
64.6.144.6: Server dropped: no data
server 198.137.202.16, port 123 …在服务器（赤壁）上正确设置了权限。如果我没有向服务器打开现有的 ssh 会话，则所有新会话都需要密码。但是，如果已经有一个打开的，额外的 ssh 会话会正确地使用公钥进行身份验证。
我的 $home 在 SD 卡上。我将authorized_keys 移到/ 并将其链接，但这并没有解决问题。
没有会话打开：
ting@core[0][09:11:32]:~$ ssh-add -L
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDXRYefDRi18Qtlkfmt/qK5dbzMk5ajMgIv4+jUyWTtL1detZAs/hoIKocqBib5ul+/snrGiFbYV1JQiiLaidXNwe1nsNCk6UMagrRaCkPxyEqiygh9Ha5pf7anVdx2sLwdSXU42qKOgmVAHolpQfZQ4r/XItmR8fbDzNgkYeT+yEpm9b69wSl2d3xWPMd+EnqiqXuUoXISvMxDXIsC8I4qff6ms4JMX1S6HxBnVUKg/4DgJ7x07m4cM6RbXvGXNy2KBMhHoy45V/lPlf8pey+Af0Zxyw+na3mlG2WmAyOCnwXKJ/9TqLpYiCUHhTR4wgmgZpLWpSyyHYZhGP951ozP /home/ting/.ssh/id_rsa
ting@core[0][09:12:35]:~$ ssh -v chibi
OpenSSH_5.5p1 Debian-4ubuntu5, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to chibi [192.168.1.2] port 22.
debug1: Connection established.
debug1: identity file /home/ting/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/ting/.ssh/id_rsa-cert type -1
debug1: identity file /home/ting/.ssh/id_dsa type -1
debug1: identity …