Le 16.12.2013 22:08, Erwan David a écrit :
Le 16/12/2013 22:05, (lists) Denis BUCHER a écrit :
Dear all,
I have a very strange problem with our postfix server. It has been
working for years without problem, but suddenly we started to have
errors with SMTP connexions from outside.
On the client side (we tested with Thunderbird and Outlook), the
connection lasts many minutes before showing a timeout error.
On the server side, the logs are always the same :
* Dec 16 21:42:33 svrmail postfix/smtpd[8531]: connect from
x-x.195-178.cust.bluewin.ch[178.195.x.x]
* Dec 16 21:44:41 svrmail postfix/smtpd[8531]: lost connection after
UNKNOWN from x-x.195-178.cust.bluewin.ch[178.195.x.x]
* Dec 16 21:44:41 svrmail postfix/smtpd[8531]: disconnect from
x-x.195-178.cust.bluewin.ch[178.195.x.x]
But the most strange point is that if I do "telnet ip_of_server 465" I
am immediately connected, and can use normal SMTP commands.
The configuration that used to work was :
* Port 465
* SSL/TLS
* Authentication : password
Does someone has an idea about what could be the cause of such a
strange problem ?
Does it has something to do with SSL/TLS ?
Are you sure your clients connect directly to postfix ?
No proxy, no anti-virus that could hijack the connection and behave
incorrectly with SSL/TLS ?
Dear Erwan,
Yes I am almost sure, I also thought about that, but normally the only
device that is between the outside world and postfix is the firewall,
and normally it doesn't do any analysis on the connection...
Is there a way to check what happens really on the connection ?
Denis
