FTP and Firewalls

[Lázaro Morales]

Hello,

I have a question about FTP service and iptables. This is the default  
configuration for iptables on Fedora. I just added the 4th rule giving  
access to port 21 running vsftpd.

# iptables -nL
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state  
RELATED,ESTABLISHED
ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp  
dpt:21
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp  
dpt:22
REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with  
icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with  
icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

When I connect through a FTP client like `ftp` all work fine but when I  
try through a web browser for example or through `yum` isn't not work.

When I remove the INPUT rules:

# iptables -F INPUT

all start working. I don't understand what is the problem and I don't wish  
remove the INPUT rules.

Regards,
Lázaro.

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