From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vs1-xe41.google.com (mail-vs1-xe41.google.com [IPv6:2607:f8b0:4864:20::e41]) by sourceware.org (Postfix) with ESMTPS id ED24D3858D31 for ; Sun, 19 Apr 2020 12:13:00 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org ED24D3858D31 Received: by mail-vs1-xe41.google.com with SMTP id r7so4157066vso.2 for ; Sun, 19 Apr 2020 05:13:00 -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=X6npIjBJw2kD4S5GLqLv6sYFvhKJJDr57bCuBPD9C+g=; b=AR0NrDorFd9QQi6ZbFaytsjtPst8WMHp275SdexIE6zt9DENnulxGtniTMvYS9C0Tz ThwRgLqj0JcU9VDwtO5Lez4aK+2f1k5I5jB4ixqAE4BXaL8QpcMj5hpsEGm+uz5pI+2g W/rVOigxt3BCrCvk9FiYYIAbm9fm/olmLkca5LEhLX249eYKotC6mM8gUUJ8MS4EP4NE DG3zaMBsENU/ZBKGSpNp+Mqqz+EgHLsvMUKUfwixrhf52WKSYCgIcW640ig9Xo9Af/ko 6lnBVvUlp12AwT3+H98sZ7FDWqrjETEX2fmfMC5U9k0gCZhrp3qRv4BNP+mSuJQ7LETK yEcw== X-Gm-Message-State: AGi0PuacYXmkr2DQ3/IFMoorsiKHaAJ1YPd/6XN+XxoSo0mDc7uLoffr 1y8bWJt6KZ4NVwo71TYo/7otz5iAE1a/njGoZ/Ck3hNl X-Google-Smtp-Source: APiQypJjCPcLO0yFscI8MLaCRT77vP2RF+89zY9K5vyQI2I/uvLO9luALRvgOnbFLHOJ8VLTj9ZsnjTC7WyoA73hObk= X-Received: by 2002:a67:eb17:: with SMTP id a23mr8538531vso.111.1587298380197; Sun, 19 Apr 2020 05:13:00 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?Q?David_Bala=C5=BEic?= Date: Sun, 19 Apr 2020 14:13:17 +0200 Message-ID: Subject: latest openssh can not connect to older server To: cygwin@cygwin.com Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-0.6 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, 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 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: Sun, 19 Apr 2020 12:13:02 -0000 Hi! I tried to backup some files from my server with scp and failed: $ scp -v root@the.server:/root/a.file . Executing: program /usr/bin/ssh host the.server, user root, command scp -v -f /root/a.file OpenSSH_8.2p1, OpenSSL 1.1.1f 31 Mar 2020 debug1: Connecting to the.server [192.168.1.11] port 22. debug1: Connection established. debug1: identity file /home/stein/.ssh/id_rsa type -1 debug1: identity file /home/stein/.ssh/id_rsa-cert type -1 debug1: identity file /home/stein/.ssh/id_dsa type -1 debug1: identity file /home/stein/.ssh/id_dsa-cert type -1 debug1: identity file /home/stein/.ssh/id_ecdsa type -1 debug1: identity file /home/stein/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/stein/.ssh/id_ecdsa_sk type -1 debug1: identity file /home/stein/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /home/stein/.ssh/id_ed25519 type -1 debug1: identity file /home/stein/.ssh/id_ed25519-cert type -1 debug1: identity file /home/stein/.ssh/id_ed25519_sk type -1 debug1: identity file /home/stein/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /home/stein/.ssh/id_xmss type -1 debug1: identity file /home/stein/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_8.2 debug1: Remote protocol version 2.0, remote software version dropbear_2011.54 debug1: no match: dropbear_2011.54 debug1: Authenticating to the.server:22 as 'root' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: (no match) Unable to negotiate with 192.168.1.11 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1 I tried OpenSSH_8.0p1-2 which is still available in the cygwin setup-x86_64.exe wizard and that version works fine. (the version above is 8.2.p1-1 in the setup wizard) Regards, David