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SMTP-server does not respond with SMTP 220 message when connecting from openvz [message #4779]

Wed, 26 July 2006 07:47

wfischer
Messages: 38
Registered: November 2005
Location: Austria/Germany

Member

Hi all,

I came across a very strange problem. When trying to send a email from an VE to a certain SMTP server, I get no SMTP 220 response.

[updated] - I filed a bug http://bugzilla.openvz.org/show_bug.cgi?id=210 after I have read http://forum.openvz.org/index.php?t=tree&goto=2376&# msg_2376

sorry if my first post has caused any inconvenience

Best wishes,
Werner

Werner Fischer, Developer of a Virtuozzo-out-of-the-box-cluster solution at Thomas-Krenn.AG

http://static.openvz.org/userbars/openvz-user.png

[Updated on: Wed, 26 July 2006 07:54]

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Re: SMTP-server does not respond with SMTP 220 message when connecting from openvz [message #4790 is a reply to message #4779]

Wed, 26 July 2006 11:18

curx
Messages: 739
Registered: February 2006
Location: Nürnberg, Germany

Senior Member

Hi,

can you connect a smtp server per telnet ?
like:

$ telnet <smtp-server> 25

maybe a "firewall" like iptables enabled ?

Regards,
Thorsten
--
tsd@debian.systs.org

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Re: SMTP-server does not respond with SMTP 220 message when connecting from openvz [message #4791 is a reply to message #4790]

Wed, 26 July 2006 11:30

wfischer
Messages: 38
Registered: November 2005
Location: Austria/Germany

Member

hi,

yea - as mentioned in the bug report I can connect this way when I'm using the centos kernel, and I'm getting the 220 SMTP response. When I'm using the openvz kernel, the tcp connection gets established (I used tcpdump in parallel, an the the SYN, SYN/ACK, ACK sequence), but the 220 response is simply missing...

I discovered this problem only with one SMTP server I try to send emails to yet - according to some messages found in google groups it seems that the receiving SMTP server is an cisco pix or something like that.

iptables is disabled.

Werner Fischer, Developer of a Virtuozzo-out-of-the-box-cluster solution at Thomas-Krenn.AG

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Re: SMTP-server does not respond with SMTP 220 message when connecting from openvz [message #4795 is a reply to message #4791]

Wed, 26 July 2006 13:21

curx
Messages: 739
Registered: February 2006
Location: Nürnberg, Germany

Senior Member

Hi,

after reading the bug-report Wink

I' ve tested it on of one Debian ve's :

please check:

$ telnet mail10.systs.org 25

<output>
Trying 212.60.156.69...
Connected to mail10.systs.org.
Escape character is '^]'.
220 mail10.systs.org ESMTP
quit
221 Bye
</output>

And it works, maybe a CentOS prob ?
Is the some specific sysctl settings on CentOS ?

Regards,
Thorsten
--
tsd@debian.systs.org

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Re: SMTP-server does not respond with SMTP 220 message when connecting from openvz [message #4796 is a reply to message #4795]

Wed, 26 July 2006 14:03

wfischer
Messages: 38
Registered: November 2005
Location: Austria/Germany

Member

As mentioned in the bug report, the problem has to do with the windows scaling of TCP - Aistis has found that (check out the bug report)

regards,
Werner

Werner Fischer, Developer of a Virtuozzo-out-of-the-box-cluster solution at Thomas-Krenn.AG

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