From owner-freebsd-net@freebsd.org  Thu Aug 25 09:10:41 2016
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 528FEBC5945
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Thu, 25 Aug 2016 09:10:41 +0000 (UTC) (envelope-from kp@FreeBSD.org)
Received: from venus.codepro.be (venus.codepro.be [IPv6:2a01:4f8:162:1127::2])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256
 bits))
 (Client CN "*.codepro.be", Issuer "Gandi Standard SSL CA 2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 209591594
 for <freebsd-net@freebsd.org>; Thu, 25 Aug 2016 09:10:41 +0000 (UTC)
 (envelope-from kp@FreeBSD.org)
Received: from [10.240.0.116] (vega.codepro.be [IPv6:2a01:4f8:162:1127::3])
 (Authenticated sender: kp)
 by venus.codepro.be (Postfix) with ESMTPSA id 38BD1A181;
 Thu, 25 Aug 2016 11:10:39 +0200 (CEST)
From: "Kristof Provost" <kp@FreeBSD.org>
To: "Carl Hattingh" <carl.hattingh@gmail.com>
Cc: freebsd-net@freebsd.org
Subject: Re: Cannot access a couple websites
Date: Thu, 25 Aug 2016 11:10:41 +0200
Message-ID: <58CC8163-E6AD-4657-9E34-0D0EB2135FEC@FreeBSD.org>
In-Reply-To: <CAEOGyNubamkqoA+eF3hkq6RMKZ0Cbk0LCChwyjGs4D16YXdJkg@mail.gmail.com>
References: <CAEOGyNubamkqoA+eF3hkq6RMKZ0Cbk0LCChwyjGs4D16YXdJkg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Mailer: MailMate (2.0BETAr6052)
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 25 Aug 2016 09:10:41 -0000

On 24 Aug 2016, at 16:02, Carl Hattingh wrote:
> We are experiencing a issue which has me rather stumped.  We are using
> Freebsd 10.3-RELEASE-p7 under Hyper-V 2012 R2 as a firewall (pf), and 
> are
> unable to browse to www.amazon.com and outlook.office365.com under 
> certain
> circumstances.
>
<snip>
>
> Has anyone got any ideas on what this could be?  We'd be grateful for 
> any
> assistance.
>
You’re going to have to make a network capture between the gateway and 
the NTU device.
Ideally not from the gateway itself (because that might hide checksum 
issues).

Regards,
Kristof