ssh 登录卡在SSH2_MSG_KEX_DH_GEX_GROUP

fmylife

我用的Ubuntu，现在这台机器登录任何服务器都卡在SSH2_MSG_KEX_DH_GEX_GROUP 不动了，然后等了一会就提示：Connection closed

信息如下，但是不知道究竟是哪里的问题，清高手帮忙

OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to remote.host.com [192.168.1.34] port 22.
debug1: Connection established.
debug1: identity file /home/vwu/.ssh/id_rsa type -1
debug1: identity file /home/vwu/.ssh/id_rsa-cert type -1
debug1: identity file /home/vwu/.ssh/id_dsa type -1
debug1: identity file /home/vwu/.ssh/id_dsa-cert type -1
debug1: identity file /home/vwu/.ssh/id_ecdsa type -1
debug1: identity file /home/vwu/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/vwu/.ssh/id_ed25519 type -1
debug1: identity file /home/vwu/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.2
debug1: match: OpenSSH_5.2 pat OpenSSH_5* compat 0x0c000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<3072<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
Connection closed by 192.168.1.34

fmylife

需要补充的是，从别的地方登目的机器是没有问题的，而且我这台源主机没有做过任何更改，今天就突然发现不能ssh登录别的机器了。

lyhabc

是不是防火墙？？？