打开特定的Linux端口

我试图打开一个端口（2012）在我的VPS，所以我可以通过互联网访问它。

这是sudo iptables -L产生的输出

Chain INPUT (policy ACCEPT) target prot opt source destination fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh ACCEPT all -- anywhere anywhere REJECT all -- anywhere loopback/8 reject-with icmp-port- ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT tcp -- anywhere anywhere tcp dpt:2012 ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:ssh ACCEPT icmp -- anywhere anywhere LOG all -- anywhere anywhere limit: avg 5/min burst 5 LOG level debug prefix "iptables denied: " DROP all -- anywhere anywhere Chain FORWARD (policy ACCEPT) target prot opt source destination DROP all -- anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere anywhere Chain fail2ban-ssh (1 references) target prot opt source destination RETURN all -- anywhere anywhere 

Nmap发现端口25,22和80.请问我可能做错了什么？

编辑：

• 托pipe/ dev /随机相关服务
• 避免客户端需要CAfile
• 启用ipv6后，lighttpd不会在启动时启动
• 如何检查Linux上当前的TCP拥塞窗口？
• ssh操作超时，试图从家里连接

netstat -anp | grep :2012 netstat -anp | grep :2012显示：

 sudo netstat -anp | grep :2012 tcp 0 0 127.0.0.1:2012 0.0.0.0:* LISTEN 15303/X-engine 

 nmap ... -p2012 ...