我也遇到了，应该不是运营商的问题，两个地方一个电信，一个移动，都有这个问题

@blijf 我和服务商咨询被封的原因，希望能配合查一下，直接说他们不管技术问题

这是我的iptables,有问题吗？

# tail /etc/sysconfig/iptables
--------------------------------------------------------------------------------# Generated by iptables-save v1.4.7 on Tue Jan 13 03:16:18 2015
*mangle
:PREROUTING ACCEPT [4171:2446379]
:INPUT ACCEPT [4171:2446379]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [4137:2969628]
:POSTROUTING ACCEPT [4137:2969628]
COMMIT
# Completed on Tue Jan 13 03:16:18 2015
# Generated by iptables-save v1.4.7 on Tue Jan 13 03:16:18 2015
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -s 127.0.0.1/32 -d 127.0.0.1/32 -j ACCEPT
-A INPUT -p tcp -m multiport --dports 53,158 -j ACCEPT
-A INPUT -p udp -m multiport --dports 53,158 -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p tcp -m multiport --dports 25,109,110,143,465,993,995 -j LOG --log-prefix "IPTABLES:" --log-level 5
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A OUTPUT -s 127.0.0.1/32 -d 127.0.0.1/32 -j ACCEPT
-A OUTPUT -p tcp -m multiport --dports 25,109,110,143,465,993,995 -j LOG --log-prefix "IPTABLES:" --log-level 5
-A OUTPUT -p tcp -m multiport --dports 25,109,110,143,465,993,995 -j DROP
COMMIT
# Completed on Tue Jan 13 03:16:18 2015

@ScotGu 你是装ss吗？能否给一个你的安装流程，比如什么系统，做了什么安全设置，比如iptables，ssh的设置

@sneezry 必须关死了