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Wed, 16 Dec 2020 15:37:13 +0000 Received: by smtp403.mail.ne1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 79d512a9f57242fe699359699341f83d; Wed, 16 Dec 2020 15:37:09 +0000 (UTC) To: cygwin cygwin From: worsafe@bellsouth.net Subject: Cygwin sshd broken by seemingly trivial network change Message-ID: <13d8e55e-bd07-24b7-628c-fa091f1c8401@bellsouth.net> Date: Wed, 16 Dec 2020 09:37:08 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US References: <13d8e55e-bd07-24b7-628c-fa091f1c8401.ref@bellsouth.net> X-Mailer: WebService/1.1.17278 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo Apache-HttpAsyncClient/4.1.4 (Java/11.0.8) X-Spam-Status: No, score=-2.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, 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: Wed, 16 Dec 2020 15:37:15 -0000 While installing a new router, I changed my local network from 192.168.4.* to 192.168.50.*. This seems to have broken Cygwin sshd on both of my remote computers, but only for Cygwin; sshd works fine if I boot the remote computer from a linux thumb drive. I have noticed no other problems with the new network configuration. -------- ssh -vvv does not give any messages that look useful to me. Authentication problems usually give some useful message, but this seems to fail before getting that far: ssh -vvv $ASUS12 OpenSSH_8.3p1, OpenSSL 1.1.1f 31 Mar 2020 debug1: Reading configuration data /home/cdr/.ssh/config debug1: /home/cdr/.ssh/config line 1: Applying options for * debug1: Reading configuration data /etc/ssh_config debug2: resolve_canonicalize: hostname 192.168.50.105 is address debug2: ssh_connect_direct debug1: Connecting to 192.168.50.105 [192.168.50.105] port 22. debug1: connect to address 192.168.50.105 port 22: Connection timed out ssh: connect to host 192.168.50.105 port 22: Connection timed out ----------- The server is running, as confirmed by cyrunsrv -Q sshd. /var/log/sshd.log is an empty file. ------- nmap shows port 22 open on the remote server: nmap -p22 $ASUS12 Nmap scan report for asus12 (192.168.50.105) Host is up (0.13s latency). PORT STATE SERVICE 22/tcp filtered ssh ---------- However, telnet fails before returning the expected header string: telnet $ASUS12 22 Connecting To 192.168.50.105...Could not open connection to the host, on port 22 : Connect failed (For comparison, linux returns the string "SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2") ------- I can't think what to try short of reinstalling sshd.