timeout when telnetting to port 25
 

Hi,

I have this problem, when telnetting on my own machine to localhost 25 it works

when I try it from another host nada

I ran tcpdump -s 1492 port 25 , when telnetting i dont get any results. (externally to my machine)

I flushed all my iptables, even put logging on in my iptables for all connections towards port 25...
and dont get any attempts/loggings when telnetting to port 25...

any idea's ? I use exim4 but I checked the config and can't find any probs there + thats apllication layer, I definately seem to have a problem in a lower layer...

thx for helping me out

i'd assume that exim is only listening on loopback or something... do you have a local_interfaces directive in your exim.conf? can you connect to the external ip address from the machine itself? that would connect to the interface but bypass any other networking.

Hi,

I've tried the following :

exim4 -bh 127.0.0.1 :

220 mydomain.com ESMTP Exim 4.50 Sun, 04 Mar 2007 16:47:59 +0100

---------

when I do exim4 -bh mywanip I get :
>>> host in hosts_connection_nolog? no (option unset)
>>> host in host_lookup? yes (matched "*")
>>> looking up host name for 195.207.150.236
>>> IP address lookup yielded mydomain.com

but I dont get the exim prompt... So I think you're right :-)

----

Any idea where I have to config this please ? my exim4 seems to have 60 config files :-/

thx

Once you figure out the config, check your netstat table.

Run. This will show you all the TCP ports that are listening on your host.

netstat -ltn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 mywanip:53 0.0.0.0:* LISTEN
tcp 0 0 mywanip:53 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:8021 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN
tcp6 0 0 :::8022 :::* LISTEN
tcp6 0 0 :::25 :::* LISTEN
tcp6 0 0 ::1:953 :::* LISTEN


any idea what the tcp6 is ? ipv6 ???

I remember commenting out in /etc/host following lines

# The following lines are desirable for IPv6 capable hosts
#::1 ip6-localhost ip6-loopback
#fe00::0 ip6-localnet
#ff00::0 ip6-mcastprefix
#ff02::1 ip6-allnodes
#ff02::2 ip6-allrouters
#ff02::3 ip6-allhosts


Cause I tought i didn't need them as I dont do ipv6, is that ok ?

I ran dpkg --reconfigure exim4 ...

Somewhere he asked me to enter the ip's that should listen on port 25.
so I entered my 2 wan ip's separated by a : colon...

i restarted the exim4 again and now I get an exim prompt when doing :

exim4 -bf wanip
220 mydomain.com ESMTP Exim 4.50 Sun, 04 Mar 2007 17:15:17 +0100

it works for both my wanip's + localhost...

but when I try to telnet externally to my ip :-/ it still doesnt work

netstat shows :

tcp 0 0 wanip1:25 0.0.0.0:* LISTEN
tcp 0 0 wanip2.235:25 0.0.0.0:* LISTEN


I'm stuck...

found the problem, my bloody isp blocked port 25 from my dsl :p ...

only have 1 thing to say, when tcpdump port 25 doesnt get a packet, some router/firewall BEFORE you're machine is DROPPING the packet :-)

thx all for yar help