I have encountered this bug today. You can reproduce it by launching ssh in Turkish locale environment:
LC_ALL=tr_TR.UTF8 ssh u...@example.com Ubuntu version is 16.10, and openssh-client version is 1:7.3p1-1. I guess the client converts parameters in config files to lowercase when parsing and gives error because both GSSAPIAuthentication and GSSAPIDelegateCredentials parameters has "I" character. Turkish have two separate "i" character dotted and dotless. Per the Unicode standard, our lowercase "i" becomes "İ" (U+0130 "Latin Capital Letter I With Dot Above") when it moves to uppercase. Similarly, our uppercase "I" becomes "ı" (U+0131 "Latin Small Letter Dotless I") when it moves to lowercase. For additional info, you can check out the links below: http://www.moserware.com/2008/02/does-your-code-pass-turkey-test.html https://blog.codinghorror.com/whats-wrong-with-turkey/ http://mattryall.net/blog/2009/02/the-infamous-turkish-locale-bug -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/1638338 Title: Can not ssh with tr_TR.UTF-8 locales (Bad configuration options) Status in openssh package in Ubuntu: Incomplete Bug description: I can not ssh to any host with Turkish locales. What I expected to happen: I expected that 'ssh some_host' command would successfully run. What actually happened 'ssh some_host' command failed with an error. Steps to produce: 1. Open a terminal 2. Run LANG=tr_TR.UTF-8 ssh some_host If I run ssh with tr_TR.UTF-8 locale, the first error I get is: $HOME/.ssh/config: line 7: Bad configuration option: Identityfile $HOME/.ssh/config: terminating, 1 bad configuration options If I commend IdentityFile option from $HOME/.ssh/config file and re- run the command, I get this: debug1: Reading configuration data ~/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * /etc/ssh/ssh_config: line 55: Bad configuration option: gssapIauthentication /etc/ssh/ssh_config: line 56: Bad configuration option: gssapIdelegatecredentials /etc/ssh/ssh_config: terminating, 2 bad configuration options If I commend GSSAPIAuthentication and GSSAPIDelegateCredentials option, I can ssh to a host. So to ssh to a host with tr_TR.UTF-8 locale, one must commend out IdentityFile, if it is used, GSSAPIAuthentication and GSSAPIDelegateCredentials optons. Workaround: LC_ALL=C ssh some_host LC_ALL=C apt-cache policy openssh-client openssh-client: Installed: 1:7.3p1-1 Candidate: 1:7.3p1-1 Version table: *** 1:7.3p1-1 500 500 http://archive.ubuntu.com/ubuntu yakkety/main amd64 Packages 100 /var/lib/dpkg/status LC_ALL=C lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.10 Release: 16.10 Codename: yakkety ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: openssh-client 1:7.3p1-1 ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0 Uname: Linux 4.8.0-26-generic x86_64 ApportVersion: 2.20.3-0ubuntu8 Architecture: amd64 CurrentDesktop: Unity Date: Tue Nov 1 19:37:35 2016 InstallationDate: Installed on 2016-10-23 (9 days ago) InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2) RelatedPackageVersions: ssh-askpass N/A libpam-ssh N/A keychain N/A ssh-askpass-gnome N/A SSHClientVersion: OpenSSH_7.3p1 Ubuntu-1, OpenSSL 1.0.2g 1 Mar 2016 SourcePackage: openssh UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1638338/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
