On Tuesday 06 April 2004 8:41 am, Oleg Savostyanov wrote:
> Hello Antony,
>
> Thank you for your answer.
>
> Now the connection does not logged
> I can see the thirst packet on mail server,
> but it is timed out
>
> telnet X.X.X.X 25
> Trying X.X.X.X...
> telnet: Unable to connect to remote host: Connection timed out
>
> This is the log from mail server:
> Tue 2004-04-06 10:31:42: [804:52:2] Accepting SMTP connection from [Y.Y.Y.Y
> : 33222]
Well, the fact that you see this in your mail log suggests to me that the TCP
handshake SYN - SYN/ACK - ACK has been completed, and the connection is now
available for data transfer.
> Tue 2004-04-06 10:31:42: [804:52:2] Socket connection closed by the other
> side (how rude!)
You're not running TCPwrappers on the mail server or something, are you, and
it needs to get a response from the client before maintaining the connection?
> Tue 2004-04-06 10:31:42: [804:52:2] Winsock Error 10053 Software caused a
> connection abort.
> Tue 2004-04-06 10:31:42: [804:52:2] Unexpected socket closure
What do you see in the packet / byte counters from "iptables -L -nvx; iptables
-L -t nat -nvx" when you try to make a connection? Do you see packets in
the PREROUTING DNAT rule, the FORWARD rule towards the mail server, and the
FORWARD rule for the replies?
Regards,
Antony.
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