X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-2.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW X-Spam-Check-By: sourceware.org MIME-Version: 1.0 Date: Thu, 5 Jan 2012 16:50:48 -0800 Message-ID: Subject: Cygwin 1.7.9 + OpenSSH 5.9p1-1 Domain Service Account error "Bad file descriptor" after authentication [SOLVED] From: William Voyek To: cygwin AT cygwin DOT com Content-Type: text/plain; charset=UTF-8 X-IsSubscribed: yes Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com In order to run a SSH server I installed Cygwin 1.7.9 + OpenSSH 5.9p1-1 on Windows 7 Enterprise SP1. I read the FAQ entry for setting up sshd in a domain located at: http://cygwin.com/faq-nochunks.html#faq.using.sshd-in-domain After completing the install I proceeded to create the cyg_server domain user account, a privileged service account group, and the necessary Group Policy with the SeTcbPrivilege, SeCreateTokenPrivilege, SeAssignPrimaryTokenPrivilege, SeServiceLogonRight, SeDenyInteractiveLogonRight, SeDenyRemoteInteractiveLogonRight privileges set for my service group. I then created the /etc/group and /etc/passwd files including the cyg_server account and ran the ssh-host-config script. I answered "yes" to all questions except for the "Do you want to use a different name?" to which I answered "no". I then issued "net start sshd" and the CYGWIN sshd service started successfully. To test I then issued "ssh localhost" and I was greeted with a password prompt. After entering the proper password I was then greeted with "Connection to localhost closed by remote host." After doing some initial checking on the system I verified that the service was running, that it was successfully authenticating my account, but when creating the tty for the remote shell sshd was throwing an error: chown(/dev/tty1, 500, 513) failed: Bad file descriptor I started searching the Cygwin mailing lists and discovered the following posts: http://cygwin.com/ml/cygwin/2010-11/msg00199.html http://cygwin.com/ml/cygwin/2011-03/msg00125.html http://cygwin.com/ml/cygwin/2011-08/msg00016.html http://cygwin.com/ml/cygwin/2011-08/msg00182.html Unfortunately in the posts it appeared that no one had posted a solution to the issue. After uninstalling and reinstalling Cygwin countless times, a clean Windows 7 install, and lots of hair pulling it appears I have discovered what the issue was (at least in my case): cyg_server must be a member of the *Local* Administrators group on the machine running the service. It was not enough that the user account is a member of the Administrators group for the domain. I just wanted to post this in case someone else runs into this issue like I did. William -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple