Question

Mandrake 9.2 and closed ports

Asked by: andyring

I've got Mandrake 9.2 installed, a new install, and am trying to set it up as a server.  Been using ancient RedHat versions for servers in the past, and it's time to modernize.

After installing, I cannot SSH into the machine, nor can I send mail into the machine.  Sending mail results in a timeout being returned to the sender after several hours.  SSH results in:

ssh_exchange_identification: Connection closed by remote host

No go on FTP as well.

I'm not real sure what's going on here.  Web services work fine (at least, I can pull up the default Apache page from outside the machine). I have SSH, FTP and SMTP ports opened in the firewall as best I can tell.  Someone suggested maybe iptables, but I don't have a clue how to configure that (or even a good conceptual grasp as to what it/they are).

Had the darndest time trying to figure out how to even configure web, mail, etc., until I found and downloaded Webmin (WebAdmin?, something like that), but it made no difference.

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Asked On
2004-03-01 at 16:59:07ID20903382
Tags

closed

,

connection

,

host

,

ports

Topic

Linux Network Security

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Comments
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Answers

 

by: jleviePosted on 2004-03-01 at 19:49:55ID: 10492132

It might be a local firewall on the Mandrake box, and you can tell if that's the case because '/usr/sbin/iptables -l' will return things other than ACCEPT. Another test is to attempt an ssh connection to localhost while logged on to the Mandrake box. If that works, but outside access fails it has to be a firewall or IP restriction in sshd_conf.

 

by: andyringPosted on 2004-03-01 at 20:03:12ID: 10492185

Well, I'm not exactly sure how to read it, but this is what I get:

(and yes, I can ssh to the box locally)


Chain INPUT (policy DROP)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere
DROP      !icmp --  anywhere             anywhere           state INVALID
eth0_in    all  --  anywhere             anywhere
common     all  --  anywhere             anywhere
LOG        all  --  anywhere             anywhere           LOG level info prefix `Shorewall:INPUT:REJECT:'
reject     all  --  anywhere             anywhere

Chain FORWARD (policy DROP)
target     prot opt source               destination
DROP      !icmp --  anywhere             anywhere           state INVALID
eth0_fwd   all  --  anywhere             anywhere
common     all  --  anywhere             anywhere
LOG        all  --  anywhere             anywhere           LOG level info prefix `Shorewall:FORWARD:REJECT:'
reject     all  --  anywhere             anywhere

Chain OUTPUT (policy DROP)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere
DROP      !icmp --  anywhere             anywhere           state INVALID
fw2net     all  --  anywhere             anywhere
common     all  --  anywhere             anywhere
LOG        all  --  anywhere             anywhere           LOG level info prefix `Shorewall:OUTPUT:REJECT:'
reject     all  --  anywhere             anywhere

Chain all2all (0 references)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere           state RELATED,ESTABLISHED
newnotsyn  tcp  --  anywhere             anywhere           state NEW tcp flags:!SYN,RST,ACK/SYN
common     all  --  anywhere             anywhere
LOG        all  --  anywhere             anywhere           LOG level info prefix `Shorewall:all2all:REJECT:'
reject     all  --  anywhere             anywhere

Chain common (5 references)
target     prot opt source               destination
icmpdef    icmp --  anywhere             anywhere
reject     udp  --  anywhere             anywhere           udp dpt:135
reject     udp  --  anywhere             anywhere           udp dpts:netbios-ns:netbios-ssn
reject     udp  --  anywhere             anywhere           udp dpt:microsoft-ds
reject     tcp  --  anywhere             anywhere           tcp dpt:netbios-ssn
reject     tcp  --  anywhere             anywhere           tcp dpt:microsoft-ds
reject     tcp  --  anywhere             anywhere           tcp dpt:135
DROP       udp  --  anywhere             anywhere           udp dpt:1900
DROP       all  --  anywhere             255.255.255.255
DROP       all  --  anywhere             BASE-ADDRESS.MCAST.NET/4
reject     tcp  --  anywhere             anywhere           tcp dpt:auth
DROP       udp  --  anywhere             anywhere           udp spt:domain state NEW
DROP       all  --  anywhere             206.222.216.207

Chain dynamic (2 references)
target     prot opt source               destination

Chain eth0_fwd (1 references)
target     prot opt source               destination
dynamic    all  --  anywhere             anywhere           state NEW

Chain eth0_in (1 references)
target     prot opt source               destination
dynamic    all  --  anywhere             anywhere           state NEW
net2fw     all  --  anywhere             anywhere

Chain fw2net (1 references)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere           state RELATED,ESTABLISHED
newnotsyn  tcp  --  anywhere             anywhere           state NEW tcp flags:!SYN,RST,ACK/SYN
ACCEPT     all  --  anywhere             anywhere

Chain icmpdef (1 references)
target     prot opt source               destination

Chain net2all (1 references)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere           state RELATED,ESTABLISHED
newnotsyn  tcp  --  anywhere             anywhere           state NEW tcp flags:!SYN,RST,ACK/SYN
common     all  --  anywhere             anywhere
LOG        all  --  anywhere             anywhere           LOG level info prefix `Shorewall:net2all:DROP:'
DROP       all  --  anywhere             anywhere

Chain net2fw (1 references)
target     prot opt source               destination
ACCEPT     all  --  anywhere             anywhere           state RELATED,ESTABLISHED
newnotsyn  tcp  --  anywhere             anywhere           state NEW tcp flags:!SYN,RST,ACK/SYN
ACCEPT     tcp  --  anywhere             anywhere           multiport dports http,https,ssh,ftp-data,ftp,smtp,pop2,pop3,imap state NEW
net2all    all  --  anywhere             anywhere

Chain newnotsyn (4 references)
target     prot opt source               destination
LOG        all  --  anywhere             anywhere           LOG level info prefix `Shorewall:newnotsyn:DROP:'
DROP       all  --  anywhere             anywhere

Chain reject (11 references)
target     prot opt source               destination
REJECT     tcp  --  anywhere             anywhere           reject-with tcp-reset
REJECT     udp  --  anywhere             anywhere           reject-with icmp-port-unreachable
REJECT     icmp --  anywhere             anywhere           reject-with icmp-host-unreachable
REJECT     all  --  anywhere             anywhere           reject-with icmp-host-prohibited

Chain shorewall (0 references)
target     prot opt source               destination
[root@dell root]#

 

by: jleviePosted on 2004-03-01 at 20:58:03ID: 10492466

Shorewall (an iptables firewall variant) is running and it is probably the problem.

Is this machine otherwise protected by a firewall? If it is you could shutdown/disable shorewall. Otherwise you'll need to modify Shorewall's rules. The doc's for shorewall can be seen at http://www.shorewall.net/

20120131-EE-VQP-002

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