我无法从任何一台机器 ssh 到我们的一台服务器（在同一个网络中）。我尝试以详细模式运行 ssh，但没有收到任何错误：
vincent@feed01:/var/cache/feed$ ssh -vvv [email protected]
OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to feed02.xxx.com [192.168.0.161] port 22.
debug1: Connection established.
debug1: identity file /home/vincent/.ssh/id_rsa type -1
debug1: identity file /home/vincent/.ssh/id_rsa-cert type -1
debug1: identity file /home/vincent/.ssh/id_dsa type -1
debug1: identity file /home/vincent/.ssh/id_dsa-cert type -1
debug1: identity file /home/vincent/.ssh/id_ecdsa type -1
debug1: identity file /home/vincent/.ssh/id_ecdsa-cert type -1
从那一刻起什么都没有发生，我必须按 Ctrl-C 才能重新获得终端的访问权限。
也auth.log没有捕获任何内容。我们尝试过不同的机器、不同的用户，但问题相同。
iptables -L INPUT -v -n | less
不返回任何内容
可能是什么问题 ？