How can I prevent the warning No xauth data; using fake authentication data for X11 forwarding?

None of the posted solutions worked for me. My client (desktop) system is running macOS 10.12.5 (Sierra). I added -v to the options for the ssh command and it told me,

debug1: No xauth program.

which means it doesn’t have a correct path to the xauth program. (On this version of macOS the path to xauth is nonstandard.) The solution was to add this line to /etc/ssh/ssh_config (may be /etc/ssh/config in some setups) or in ~/.ssh/config (if you don’t have admin rights):

XAuthLocation /opt/X11/bin/xauth

Now the warning message is gone.

Related Posts:

  1. Forward X11 failed: Network error: Connection refused
  2. Git: How to solve Permission denied (publickey) error when using Git?
  3. Putty: Getting Server refused our key Error
  4. Copying a local file from Windows to a remote server using scp
  5. ssh: The authenticity of host ‘hostname’ can’t be established
  6. ssh “permissions are too open” error
  7. Permission denied (publickey,keyboard-interactive)
  8. How to deal with “Pseudo-terminal will not be allocated because stdin is not a terminal.”
  9. What is actually in known_hosts?
  10. ‘heroku’ does not appear to be a git repository
  11. How to solve “sign_and_send_pubkey: signing failed: agent refused operation”?
  12. How to fix request failed on channel 0
  13. How to scp in Python?
  14. PuTTY PSCP error “Local to local copy not supported” when username contains a slash
  15. Starting ssh-agent on Windows 10 fails: “unable to start ssh-agent service, error :1058”
  16. Git error: “Host Key Verification Failed” when connecting to remote repository
  17. Convert PEM to PPK file format
  18. X Error of failed request: BadValue (integer parameter out of range for operation)
  19. Copying files using rsync from remote server to local machine
  20. How to read iPhone files without jailbreaking?
  21. SSH to Vagrant box in Windows?
  22. How to use Sublime over SSH
  23. Use qdel to delete all my jobs at once, not one at a time
  24. Automating command/script execution using PuTTY
  25. Public and Private Keys are Incorrect for user
  26. How to automate SSH login with password?
  27. ssh returns “Bad owner or permissions on ~/.ssh/config”
  28. How do I change my private key passphrase?
  29. Create a public SSH key from the private key?
  30. How do diff over ssh?
  31. “Add correct host key in known_hosts” / multiple ssh host keys per hostname?
  32. SSH use only my password, Ignore my ssh key, don’t prompt me for a passphrase
  33. ssh-agent forwarding and sudo to another user
  34. Non interactive git clone (ssh fingerprint prompt) [duplicate]
  35. How to check sshd log?
  36. What does “Warning: untrusted X11 forwarding setup failed: xauth key data not generated” mean when ssh’ing with -X?
  37. What’s the difference between authorized_keys and authorized_keys2?
  38. Is my password compromised because I forgot to hit Enter after ssh username?
  39. How do I make ssh fail rather than prompt for a password if the public-key authentication fails?
  40. ssh-keygen does not create RSA private key
  41. OpenSSH: Difference between internal-sftp and sftp-server
  42. What significance does the user/host at the end of an SSH public key file hold?
  43. SSH Suddenly returning Invalid format
  44. How to recover from “Too many Authentication Failures for user root”
  45. SFTP logging: is there a way?
  46. Why does my OpenSSH key fingerprint not match the AWS EC2 console keypair fingerprint?
  47. Login without running bash_profile or bashrc
  48. How do I do Multihop SCP transfers between machines?
  49. scp without known_hosts check
  50. How do I validate an RSA SSH public key file (id_rsa.pub)?
  51. How can I run arbitrarily complex command using sudo over ssh?
  52. Add comment to existing SSH public key
  53. ssh connection takes forever to initiate, stuck at “pledge: network”
  54. What is the benefit of not allocating a terminal in ssh?
  55. bad ownership or modes for chroot directory component
  56. Why Block Port 22 Outbound?
  57. Ansible stuck on gathering facts
  58. Is it possible to use rsync over sftp (without an ssh shell)?
  59. SSH Allow Password For One User, Rest Only Allow Public Keys [duplicate]
  60. What does (~0L) mean?
  61. ssh : Permission denied (publickey,gssapi-with-mic)
  62. ssh connect Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password)
  63. Could not open a connection to your authentication agent
  64. How to establish ssh key pair when “Host key verification failed”
  65. AWS – Disconnected : No supported authentication methods available (server sent :publickey)
  66. How to set ssh timeout?
  67. mysql_config not found when installing mysqldb python interface
  68. ssh: Could not resolve hostname [hostname]: nodename nor servname provided, or not known
  69. Pseudo-terminal will not be allocated because stdin is not a terminal
  70. How can I specify a display?
  71. Getting “socket.error: [Errno 61] Connection refused” python paramiko
  72. Getting stty: standard input: Inappropriate ioctl for device when using scp through an ssh tunnel
  73. Copying files from server to local computer using SSH
  74. Could not create work tree dir ‘example.com’.: Permission denied
  75. Paramiko’s SSHClient with SFTP
  76. Webdriver Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms
  77. Why does WordPress need my private ssh key to update?
  78. How can I use WP-CLI commands without –allow-root
  79. Configure WordPress to connect to Mysql DB using SSH tunneling
  80. Failure to establish connection when provisioning via ansible-playbook server.yml
  81. WP-CLI alias: connect with ssh proxy
  82. WPTerm ssh connection not working [closed]
  83. Server configuration for WordPress – Do I need install PHP-SSH extensions for WordPress on Fedora28?
  84. Unable to update WordPress or install plugins/themes
  85. After upgrade to php 7 plugin/them updates broke [closed]
  86. Index.php using 100% CPU [closed]
  87. Public and Private keys incorrect for user
  88. Configuring WordPress permissions for easy updates
  89. Can I automatically add a new host to known_hosts?
  90. Is it normal to get hundreds of break-in attempts per day?
  91. how to disable SSH login with password for some users?
  92. how do you create an ssh key for another user?
  93. ssh tunnel refusing connections with “channel 2: open failed”
  94. SSH from A through B to C, using private key on B [closed]
  95. Show all users and their groups/vice versa
  96. How can I edit the welcome message when ssh start?
  97. What’s wrong with always being root?
  98. Hundreds of failed ssh logins
  99. protocol version mismatch — is your shell clean?
  100. Why is ssh agent forwarding not working?

Leave a Comment