Port is open but I am unable to connect

Sascha Reissner sascha.reissner at toxicnet.de
Tue Sep 7 21:35:04 CEST 2004


just to make sure.. you are certain, that you want -s 1.2.3.4?

this means source ip is 1.2.3.4 (so the ip you connect from, not the ip 
you connect _to_)


Jacob Friis Larsen wrote:
> When I add -s 1.2.3.4 I am unable to connect to my server.
> nmap shows that the correct ports are open.
> Any ideas?
> 
> iptables -A INPUT -s 1.2.3.4 -j ACCEPT -p tcp --dport 22 -m state 
> --state NEW
> 
> This is my script:
> <script>
> #!/bin/sh
> 
> # Modules
> modprobe ip_conntrack_ftp
> 
> # Defaults
> iptables -P INPUT DROP
> iptables -P FORWARD DROP
> iptables -P OUTPUT DROP
> 
> # Flush
> iptables -t nat -F POSTROUTING
> iptables -t nat -F PREROUTING
> iptables -t nat -F OUTPUT
> iptables -F
> 
> # STATE RELATED for router
> iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> # Localhost
> iptables -A INPUT -i lo -j ACCEPT
> iptables -A OUTPUT -o lo -j ACCEPT
> 
> # Open ports on router for server/services
> iptables -A INPUT -s 1.2.3.4 -j ACCEPT -p tcp --dport 20 -m state 
> --state NEW
> iptables -A INPUT -s 1.2.3.4 -j ACCEPT -p tcp --dport 21 -m state 
> --state NEW
> iptables -A INPUT -s 1.2.3.4 -j ACCEPT -p tcp --dport 22 -m state 
> --state NEW
> iptables -A INPUT -j ACCEPT -p tcp --dport 25 -m state --state NEW
> iptables -A INPUT -j ACCEPT -p tcp --dport 80 -m state --state NEW
> iptables -A INPUT -j ACCEPT -p tcp --dport 143 -m state --state NEW
> iptables -A INPUT -j ACCEPT -p tcp --dport 993 -m state --state NEW
> </script>
> 
> Thanks,
> Jacob
> 
> 




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