From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-il1-x136.google.com (mail-il1-x136.google.com [IPv6:2607:f8b0:4864:20::136]) by sourceware.org (Postfix) with ESMTPS id E64B0395C84A for ; Thu, 14 May 2020 15:54:59 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org E64B0395C84A Received: by mail-il1-x136.google.com with SMTP id n11so3794116ilj.4 for ; Thu, 14 May 2020 08:54:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=9WuSMWTL0gcQWyRhXPo88vxXjo66t8lugAA5p9Attmo=; b=XpFWqqav/EoYJx6j7byRli7TeCQug6/mSLuVvFedYlzHblhZ5Vor/Te88dd5RbFo1d 1kErDSKLXBZiIGm2d3/1Rb9bVoCLMJikw6NulnDsppfFqA3YOHQyL1GtzehKGLfVwGvc viDOwmrJt1dFiLSa1HU3SRmx4Gu1rz9nwqNsXhzFPShnRmLoDA4HoOrhsTQL3GsVG8/P XNgcFFmGFaSmMF0mReDcrE8a8f5xNN6aWlOHC9Eqkh2b6wlfSgphkSnwH9bKmhX64eL2 tq7dGvDIkOVfLZkhy7+fr9ZMijhWntw+MCqHrZlGNANfh75xFki4Vo/ewXJoiAaWC6ft o2dg== X-Gm-Message-State: AOAM531UJtiwSeB+dDtdgN+xkknCYkBQVsh3bXjGvmeHHHDQwtso5035 6bYJPMmvQea9hso4ghPyOlYXo0zyqhD5jr93q2ko/AvatQo= X-Google-Smtp-Source: ABdhPJzbsNttxCGpHsNkgjNxoHm4vMjjRZycvqerewM+WKhHFfXMcp7gsMkTiBHlZxprpYhmqGP65rHTCJvJd368eXk= X-Received: by 2002:a92:3556:: with SMTP id c83mr4815808ila.218.1589471698776; Thu, 14 May 2020 08:54:58 -0700 (PDT) MIME-Version: 1.0 From: Chad Kimes Date: Thu, 14 May 2020 11:54:47 -0400 Message-ID: Subject: www.cygwin.com DNS setup To: cygwin@cygwin.com X-Spam-Status: No, score=-3.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, HTML_MESSAGE, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 May 2020 15:55:10 -0000 Hi all, I'm investigating an issue with GitHub Actions runners having issues connecting to www.cygwin.com: https://github.com/actions/virtual-environments/issues/698 I worked with the Azure DNS team and in this comment I detail what we believe to be the likely issue. Summarized: www.cygwin.com is CNAME'd to server2.sourceware.org server2.sourceware.org is an NS server for sourceware.org We believe that the above configuration is triggering a bug in WinDNS that is causing intermittent DNS resolution failures. I don't have an ETA for resolution from the Azure DNS team, and internally I'm translating that to be on the order of months before we see a fix. In order to resolve this faster for customers, I'm reaching out to see what options we have for updating the DNS records that are triggering this bug. Is there a change you can make to either www.cygwin.com or server2.sourceware.org DNS such that it doesn't have this recursive reference issue? Some options are to replace the CNAME with an A record, or to use something like ns2.sourceware.org for the NS record instead of server2.sourceware.org which is being used for cygwin's A record reference. Thanks, -Chad