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ip_conntrack_ftp and connecting to remote hosts
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mno
Apprentice
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Joined: 29 Dec 2003
Posts: 292
Location: Toronto, Canada

PostPosted: Sun Aug 23, 2015 9:22 pm    Post subject: ip_conntrack_ftp and connecting to remote hosts Reply with quote

Hi everyone, apologies for a stupid question. I'm trying to ftp from a Gentoo box to a different server. I'm successfully logging in, but subsequently get "No route to host" errors. As per a few articles, it seems an issue on my side with ip_conntrack_ftp missing, but it is set in my kernel .config:

Code:
CONFIG_NETFILTER_NETLINK=y
CONFIG_NETFILTER_NETLINK_LOG=y
CONFIG_NF_CONNTRACK=y
CONFIG_NF_LOG_COMMON=m
CONFIG_NF_CONNTRACK_SECMARK=y
CONFIG_NF_CONNTRACK_PROCFS=y
CONFIG_NF_CONNTRACK_FTP=y
CONFIG_NF_CONNTRACK_IRC=y


I log in successfully via ftp, but then get this error:

Code:
lastochka springloaded # ftp a2plcpnl0112.prod.iad2.secureserver.net
Connected to a2plcpnl0112.prod.iad2.secureserver.net (198.71.226.39).
220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
220-You are user number 12 of 500 allowed.
220-Local time is now 14:20. Server port: 21.
220-This is a private system - No anonymous login
220 You will be disconnected after 15 minutes of inactivity.
Name (a2plcpnl0112.prod.iad2.secureserver.net:max): xxxxx
500 This security scheme is not implemented
SSL not available
331 User xxxxx OK. Password required
Password:
230 OK. Current restricted directory is /
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> ls
200 PORT command successful
425 Could not open data connection to port 40027: No route to host
ftp>


Just in case, my local iptables config:

Code:
lastochka springloaded # iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED
ACCEPT     icmp --  anywhere             anywhere
ACCEPT     all  --  anywhere             anywhere
ACCEPT     tcp  --  anywhere             anywhere             state NEW tcp dpt:9517
ACCEPT     udp  --  anywhere             anywhere             udp dpt:domain state NEW,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:domain state NEW,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:https
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:ftp
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:smtp
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:pop3
REJECT     all  --  anywhere             anywhere             reject-with icmp-port-unreachable

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination


As the other host is GoDaddy, I suspect an issue on my end. As well, I can connect from FileZilla and do file uploads from my home desktop.

Thank you in advance.
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thoughtform
Guru
Guru


Joined: 24 May 2004
Posts: 594
Location: east coast USA

PostPosted: Sat Dec 05, 2015 2:53 am    Post subject: Reply with quote

You have a rule to allow the ftp control connection:

ACCEPT tcp -- anywhere anywhere tcp dpt:ftp

the data connection is on another port, could even be a dynamic port.
What happens if you temporarily stop your firewall?
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TigerJr
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Joined: 19 Jun 2007
Posts: 357
Location: /dev/x0

PostPosted: Sat Dec 05, 2015 5:50 pm    Post subject: Reply with quote

Try to use PASV command
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