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RE: Hotmail blackholing certain IP ranges ?
- From: Leigh Porter
- Date: Wed Apr 25 19:46:27 2007
Title: RE: Hotmail blackholing certain IP ranges ?
Yeah they and a few others started doing this not too long ago (few months). I thought perhaps something common got upgraded/patched but then I just thought that it was a rather odd configuration change..
It certainly is new. A chap I know (for some reason) set his source port for queries to be port 53 and his DNS queries started to fail.
From: owner-nanog@xxxxxxxxx on behalf of Chris Edwards
Sent: Wed 4/25/2007 10:43 PM
Subject: Re: Hotmail blackholing certain IP ranges ?
Some sites have recently reported problems mailing hotmail due to
inability to resolve the hotmail MX records. This appears to be due to
the hotmail DNS servers now blackholing DNS queries where the UDP source
port was < 1024.
I can reproduce this here and now, but don't know if it's new.
Chris Edwards, Glasgow University Computing Service