Re: [exim] In LAN, initial delay suddenly appear...

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Lähettäjä: Heiko Schlittermann
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Vastaanottaja: exim-users
Aihe: Re: [exim] In LAN, initial delay suddenly appear...
Marco Gaiarin <marcogaio@???> (Do 11 Jun 2015 15:53:07 CEST):
>
> I've just upgrade a server from debian squeeze to debian wheezy, using a
> custom config file i use in my servers; i've changed a little the config
> file, mostly adding STARTTLS with auth.

….
> I've tried with a client (Thunderbird ESR latest version, Windows 7) and a
> tshark dump depicted:
>
>   0.000000   10.27.2.25 -> 10.27.1.3    TCP 66 49989 > 587 [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
>   0.000019    10.27.1.3 -> 10.27.2.25   TCP 66 587 > 49989 [SYN, ACK] Seq=0 Ack=1 Win=14600 Len=0 MSS=1460 SACK_PERM=1 WS=128
>   0.000384   10.27.2.25 -> 10.27.1.3    TCP 60 49989 > 587 [ACK] Seq=1 Ack=1 Win=65536 Len=0
>   5.001534    10.27.1.3 -> 10.27.2.25   SMTP 127 S: 220 stregatto.pp.lnf.it ESMTP Exim 4.80 Thu, 11 Jun 2015 15:25:59 +0200
>   5.003000   10.27.2.25 -> 10.27.1.3    SMTP 73 C: EHLO [10.27.2.25]
>   5.003069    10.27.1.3 -> 10.27.2.25   TCP 54 587 > 49989 [ACK] Seq=74 Ack=20 Win=14720 Len=0
>   5.003407    10.27.1.3 -> 10.27.2.25   SMTP 184 S: 250-stregatto.pp.lnf.it Hello [10.27.2.25] [10.27.2.25] | 250-SIZE 26214400 | 250-8BITMIME | 250-PIPELINING | 250-STARTTLS | 250 HELP
>   5.004375   10.27.2.25 -> 10.27.1.3    SMTP 64 C: STARTTLS

>
> note the 5 seconds between the TCP handshake and the SMTP banner printout.


This can be the rfc1413 timeout. Check your config for
rfc1413_query_timeout and set this to 0s (or add this option, since the
default value is 5s).

Linux probably just refuses the connection, while windows drops the
connection attempts, leading to a timeout.

> Someone can give me a clue on how to debug that issue? I really don't now
> where to hit my head...


You may tcpdump/tshark trace the ident protocol port 113/tcp.

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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