LinuxQuestions.org - vsftpd - Can't connect externally???

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vsftpd - strange remote behaviour

So, I am relatively new to Linux, and I set up an ftp on my friends computer so I could download some of his files, It's Red hat 8 running vsftpd (I hope!)

anyway, When on his machine or logged in remotely via ssh, I can say "Ftp localhost" and it works fine, asks for my username/password and then allows me to view my files.

Now, when I came home and tried to do the same, it said :

Code:

[xgkkp@nick xgkkp]$ ftp 80.X.XXX.X

Connected to 80.X.XXX.X (80.X.X.X).

421 Service not available, remote server has closed connection

ftp>

Does anyone have a clue what is going on? He's directly connected through a cable modem, and I am through a firewall-type-thing.

Thanks a lot,

Nick

Welcome to LQ.

Check to see if he has any firewalls running at his end:
iptables -L

Code:

Chain INPUT (policy ACCEPT)

target    prot opt source              destination

RH-Lokkit-0-50-INPUT  all  --  anywhere            anywhere



Chain FORWARD (policy ACCEPT)

target    prot opt source              destination

RH-Lokkit-0-50-INPUT  all  --  anywhere            anywhere



Chain OUTPUT (policy ACCEPT)

target    prot opt source              destination



Chain RH-Lokkit-0-50-INPUT (2 references)

target    prot opt source              destination

ACCEPT    udp  --  cache2.ntli.net      anywhere          udp spt:domain dpts:1025:65535

ACCEPT    udp  --  cache1.ntli.net      anywhere          udp spt:domain dpts:1025:65535

ACCEPT    tcp  --  anywhere            anywhere          tcp dpt:ssh flags:SYN,RST,ACK/SYN

ACCEPT    udp  --  anywhere            anywhere          udp spts:bootps:bootpc dpts:bootps:bootpc

ACCEPT    udp  --  anywhere            anywhere          udp spts:bootps:bootpc dpts:bootps:bootpc

ACCEPT    all  --  anywhere            anywhere

REJECT    tcp  --  anywhere            anywhere          tcp dpts:0:1023 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable

REJECT    tcp  --  anywhere            anywhere          tcp dpt:nfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable

REJECT    udp  --  anywhere            anywhere          udp dpts:0:1023 reject-with icmp-port-unreachable

REJECT    udp  --  anywhere            anywhere          udp dpt:nfs reject-with icmp-port-unreachable

REJECT    tcp  --  anywhere            anywhere          tcp dpts:x11:6009 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable

REJECT    tcp  --  anywhere            anywhere          tcp dpt:xfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable

I have no idea how to read this

IT looks like you are blockign port 21 (ftp). Try running "lokkit" and change the firewall settings to allow ftp. Either that or disable the firewall (not recommended but good for testing):
iptables -F

Ideally you should make your own firewall rules instead of using lokkit as it is much more advanced yet easier to understand.

Ahhh thanks very much, it works perfectly.

Out of curiosity, what would have been the equivalent command to manaully add an iptable rule?

Something like:
iptables -A INPUT -p tcp --dport 21 -j ACCEPT