BubbleUpnpServer 的 Iptables 配置

Question

突然，我的 bubbleupnpserver 无法连接到 http 端口 58050 和 https 端口 58051。昨天还可以，服务器没有任何变化，今天就不行了。也许是 fail2ban？错误：

HTTP: ERROR: Cannot connect. Check that the public host name is valid and that port 58050 is opened on your router

HTTPS: ERROR: Cannot connect. Check that the public host name is valid and that port 58051 is opened on your router

这是 iptables 的输出：

 sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     tcp  --  anywhere             ns375259.ip-5-196-88.eu  tcp dpt:58051
ACCEPT     tcp  --  anywhere             ns375259.ip-5-196-88.eu  tcp dpt:58050
f2b-sshd   tcp  --  anywhere             anywhere             multiport dports s                         sh

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain f2b-sshd (1 references)
target     prot opt source               destination
RETURN     all  --  anywhere             anywhere

根据建议，在 netstat -tulpn 上我发现了 2 个带有此端口的条目，它看起来像这样：

tcp        0      0 0.0.0.0:58050           0.0.0.0:*               LISTEN      1455/java
tcp        0      0 0.0.0.0:58051           0.0.0.0:*               LISTEN      1455/java