On Tue, May 07, 2013 at 10:59:45PM -0700, mailtime wrote:
> It starts to go wrong around Frame 24660:
> I did disable window scaling on Postfix
What do you mean by "on Postfix"? This is a kernel setting, modified
via "sysctl" or similar. In any case the session you posted has
no window scaling
Thanks both for the info. I have attached a log file showing the tcp
information.
It starts to go wrong around Frame 24660:
I did disable window scaling on Postfix and for a while i thought it had
solved the issue but then more of the same as you can see in the log.
(hopefully showing the correct
Viktor Dukhovni:
> On Tue, May 07, 2013 at 12:57:27PM -0400, Wietse Venema wrote:
>
> > Viktor Dukhovni:
> > > That said, clearly some packets from the sender are lost, and never
> > > retransmitted. The TCP connection negotiates selective ACK and
> > > window scaling on both sides. First thing
On Tue, May 07, 2013 at 12:57:27PM -0400, Wietse Venema wrote:
> Viktor Dukhovni:
> > That said, clearly some packets from the sender are lost, and never
> > retransmitted. The TCP connection negotiates selective ACK and
> > window scaling on both sides. First thing I would do is disable
> > win
Viktor Dukhovni:
> That said, clearly some packets from the sender are lost, and never
> retransmitted. The TCP connection negotiates selective ACK and
> window scaling on both sides. First thing I would do is disable
> window scaling on your Postfix server. This will reduce throughput
> for mai
On Tue, May 07, 2013 at 04:46:35AM -0700, mailtime wrote:
> Thanks for your advice Viktor
> I have done a capture and loaded into WireShark.
The wireshark output, which omits much detail, (but the GUI allows
you to drill in various details) is for you to interpret. If you
want help from me, post
Thanks for your advice Viktor
I have done a capture and loaded into WireShark.
1,"0.00","1.2.3.4","192.168.1.239","TCP","66","19524 > smtp [SYN] Seq=0
Win=8192 Len=0 MSS=1380 WS=256 SACK_PERM=1"
2,"0.22","192.168.1.239","1.2.3.4","TCP","66","smtp > 19524 [SYN, ACK]
Seq=0 Ack=1 Win=5840 Le
On Thu, May 02, 2013 at 11:09:35PM -0700, mailtime wrote:
> 20:08:45.927 TX: SIZE=6469087>
The message size is ~6 MB.
> 20:08:50.163 TX:
> 20:08:50.323 RX: <354 End data with .>
Message content transmission starts at 20:08:50.323.
> 20:09:12.407 SMTPResponse(Sending Body): Socket error - 100
Thanks for your thoughts i will follow that article and see what i get back.
In regard to the 14039, no only the 4 entries (pertaining to that
transaction)
I do finally have a log file from one of sending mail servers though.
20:08:45.214 RX: <220 spambox.co.nz ESMTP Postfix>
20:08:45.214 TX:
20
On Thu, May 02, 2013 at 10:31:07PM -0700, mailtime wrote:
> After many years of hassle free use from our email system we are now getting
> a rather odd disconnect as shown below.
>
>
> May 3 16:07:36 spambox nss_wins[14039]: connect from
> sender.remote.com[1.2.3.4]
Yuck, nss_wins openlog(3) b
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