I'm having some troubles getting a Debian webserver to open up port 80 for HTTP traffic. In my iptables, I opened up port 80 using the following commands:
iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p udp --dport 80 -j ACCEPT
Running an iptables -L then showed the following rules:
Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:www ACCEPT tcp -- anywhere anywhere tcp dpt:www Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination
However, after all of this, I ran nmap -sS 127.0.0.1 and discovered that port 80 still isn't open. Here are the results:
Nmap scan report for localhost (127.0.0.1) Host is up (0.0000080s latency). Not shown: 995 closed ports PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 111/tcp open rpcbind 3306/tcp open mysql 8080/tcp open http-proxy
How is it possible for rules to be in place to open a port in iptables but still have that same port closed in Nmap? Does anyone have any ideas?