[162836] in North American Network Operators' Group
Re: Could not send email to office 365
daemon@ATHENA.MIT.EDU (JoeSox)
Thu May 2 13:16:45 2013
In-Reply-To: <2AEB6E00-1ECA-460F-A656-98085B5F053D@hopcount.ca>
Date: Thu, 2 May 2013 10:16:06 -0700
From: JoeSox <joesox@gmail.com>
To: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Our Technical Support is reporting a big jump in Outlook connectivity
issues about 5-10 minutes ago.
Our resolvers are testing fine.
--
Thanks, Joe
On Thu, May 2, 2013 at 4:53 AM, Joe Abley <jabley@hopcount.ca> wrote:
>
> On 2013-05-02, at 02:42, Cathy Almond <cathya@isc.org> wrote:
>
> > This may be a red herring, but I've heard of some dropping of DNS
> > queries for the names within outlook.com domains where the queries are
> > all coming from source port 53 (i.e. your recursive server doesn't use
> > query source port randomization
>
> ... or there's a NAT or some other box in front of the recursive server
> which re-writes the source port...
>
> > ). Might be worth checking what the
> > recursive server you're using is doing?
> >
> > See https://www.dns-oarc.net/oarc/services/porttest
>
>
> Joe
>
