Iptables规则导致HTTP/HTTPS端口放行失效，phpMyAdmin无法访问的问题求助

各位大佬好，我最近碰到个头疼的问题：只要iptables处于运行状态，我的phpMyAdmin就没法访问了。我试着添加了针对80、443端口的放行规则，但完全没效果，实在摸不着头绪，想请大家帮忙看看问题出在哪！

以下是我当前的iptables规则输出（执行命令 iptables -L -v -n | more 得到的结果）：

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination
0     0 REJECT     17   --  *      *       0.0.0.0/0            0.0.0.0/0            recent: UPDATE seconds: 60 name: UDP-PORTSCAN side: source mask: 255.255.255.255 reject-with icmp-port-unreachable
0     0 REJECT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            recent: UPDATE seconds: 60 name: TCP-PORTSCAN side: source mask: 255.255.255.255 reject-with tcp-reset
4040 2195K ACCEPT     0    --  *      *       0.0.0.0/0            0.0.0.0/0            state RELATED,ESTABLISHED
0     0 ACCEPT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:5055
0     0 ACCEPT     0    --  lo     *       0.0.0.0/0            0.0.0.0/0
1   646 ACCEPT     17   --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:500
0     0 ACCEPT     17   --  *      *       0.0.0.0/0            0.0.0.0/0            udp dpt:4500
35  1764 DROP       0    --  *      *       0.0.0.0/0            0.0.0.0/0
0     0 ACCEPT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:80
0     0 ACCEPT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            tcp dpt:443
0     0 REJECT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with tcp-reset
0     0 REJECT     6    --  *      *       0.0.0.0/0            0.0.0.0/0            recent: SET name: TCP-PORTSCAN side: source mask: 255.255.255.255 reject-with tcp-reset
0     0 REJECT     17   --  *      *       0.0.0.0/0            0.0.0.0/0            reject-with icmp-port-unreachable
0     0 REJECT     17   --  *      *       0.0.0.0/0            0.0.0.0/0            recent: SET name: UDP-PORTSCAN side: source mask: 255.255.255.255 reject-with icmp-port-unreachable

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target     prot opt in     out     source               destination
3652 1884K ACCEPT     0    --  *      *       10.10.141.0/24       0.0.0.0/0            policy match dir in pol ipsec proto 50
4808 4752K ACCEPT     0    --  *      *       0.0.0.0/0            10.10.141.0/24       policy match dir out pol ipsec proto 50
4  5120 DROP       0    --  *      *       0.0.0.0/0            0.0.0.0/0

Chain OUTPUT (policy ACCEPT 6539 packets, 5343K bytes)
pkts bytes target     prot opt in     out     source               destination

我试过添加这条规则来放行80和443端口，但完全没起作用：
iptables -A OUTPUT -p tcp -m multiport --dports 80,443 -m state --state NEW -j ACCEPT

有没有大佬能帮我分析下问题根源？万分感谢！

备注：内容来源于stack exchange，提问作者user1055140