ssh X11 forwarding not working on FreeBSD 6.2

Tue Jul 24 16:48:12 UTC 2007

On Tue, 2007-07-24 at 10:59 -0500, Terry Todd wrote:
> I have installed Xming successfully on a Windows XP system. 
> It works OK to a FC6 system and an older UNIXware system. 
>  
> However when trying to connect to a FreeBSD 6.2 system with PuTTY
> ssh it doesn't work.  PuTTY has Enable X11 forwarding checked.
>  
> Here's what I get: 
>  
> $ 
> $ xhost 
> Xlib: connection to "localhost:10.0" refused by server 
> Xlib: PuTTY X11 proxy: wrong authentication protocol attempted 
> xhost: unable to open display "localhost:10.0" 
> $ 
>  
> What can be wrong? 
>  
> I have ssh configured as follows: 
> # grep X11 /etc/ssh/* 
> /etc/ssh/ssh_config:ForwardX11 yes 
> /etc/ssh/ssh_config:ForwardX11Trusted yes 
> /etc/ssh/sshd_config:X11Forwarding yes 
> /etc/ssh/sshd_config:X11DisplayOffset 10 
> /etc/ssh/sshd_config:X11UseLocalhost yes 
>  

Start by changing the following line from

X11DisplayOffset 10

to

X11DisplayOffset 1

According to the sshd_conf man page, looks like the number should be set
to the display that you want to forward (the first available display).

> Here is the Xming log file: 
> Welcome to the Xming X Server 
> Vendor: Colin Harrison 
> Release: 6.9.0.24 
> FreeType2: 2.3.0 
> Contact: http://sourceforge.net/forum/?group_id=156984 
> 
> C:\Program Files\Xming\Xming.exe :0 -ac -clipboard -multiwindow  
>  
> XdmcpRegisterConnection: newAddress x.x.x.x 
> winPrefsLoadPreferences: C:\Program Files\Xming\Xmingrc 
> LoadPreferences: Done parsing the configuration file... 
> winAdjustVideoModeShadowGDI - Using Windows display depth of 32 bits per pixel 
> winAllocateFBShadowGDI - Creating DIB with width: 1600 height: 1200 depth: 32 
> winInitVisualsShadowGDI - Masks 00ff0000 0000ff00 000000ff BPRGB 8 d 24 bpp 32 
> glWinInitVisuals:1511: glWinInitVisuals 
> init_visuals:1055: init_visuals 
> null screen fn ReparentWindow 
> null screen fn RestackWindow 
> InitQueue - Calling pthread_mutex_init 
> InitQueue - pthread_mutex_init returned 
> InitQueue - Calling pthread_cond_init 
> InitQueue - pthread_cond_init returned 
> winInitMultiWindowWM - Hello 
> winInitMultiWindowWM - Calling pthread_mutex_lock () 
> winMultiWindowXMsgProc - Hello 
> winMultiWindowXMsgProc - Calling pthread_mutex_lock () 
> glWinScreenProbe:1390: glWinScreenProbe 
> fixup_visuals:1303: fixup_visuals 
> init_screen_visuals:1336: init_screen_visuals 
> (--) 5 mouse buttons found 
> (--) Setting autorepeat to delay=500, rate=31 
> (--) winConfigKeyboard - Layout: "00000409" (00000409)  
> (--) Using preset keyboard for "English (USA)" (409), type "4" 
> Could not init font path element C:\Program Files\Xming/fonts/misc/, removing from list! 
> Could not init font path element C:\Program Files\Xming/fonts/TTF/, removing from list! 
> Could not init font path element C:\Program Files\Xming/fonts/Type1/, removing from list! 
> Could not init font path element C:\Program Files\Xming/fonts/75dpi/, removing from list! 
> Could not init font path element C:\Program Files\Xming/fonts/100dpi/, removing from list! 
> Could not init font path element C:\Program Files\Xming\fonts\dejavu, removing from list! 
> Could not init font path element C:\Program Files\Xming\fonts\cyrillic, removing from list! 
> Could not init font path element C:\WINDOWS\Fonts, removing from list! 
> winInitMultiWindowWM - pthread_mutex_lock () returned. 
> winInitMultiWindowWM - pthread_mutex_unlock () returned. 
> winMultiWindowXMsgProc - pthread_mutex_lock () returned. 
> winInitMultiWindowWM - DISPLAY=127.0.0.1:0.0 
> winMultiWindowXMsgProc - pthread_mutex_unlock () returned. 
> winMultiWindowXMsgProc - DISPLAY=127.0.0.1:0.0 
> winProcEstablishConnection - Hello 
> winInitClipboard () 
> winProcEstablishConnection - winInitClipboard returned. 
> winInitMultiWindowWM - XOpenDisplay () returned and successfully opened the display. 
> winClipboardProc - Hello 
> DetectUnicodeSupport - Windows XP 
> winClipboardProc - DISPLAY=127.0.0.1:0.0 
> winMultiWindowXMsgProc - XOpenDisplay () returned and successfully opened the display. 
> winClipboardProc - XOpenDisplay () returned and successfully opened the display. 
>  
> 
> Here is the PuTTY event log: 
> 2007-07-24 09:53:57 Looking up host "x.x.x.x" 
> 2007-07-24 09:53:57 Connecting to x.x.x.x port 22 
> 2007-07-24 09:53:57 Server version: SSH-2.0-OpenSSH_4.5p1 FreeBSD-20061110 
> 2007-07-24 09:53:57 We claim version: SSH-2.0-PuTTY_Snapshot_2005_05_03:r5737 
> 2007-07-24 09:53:57 Using SSH protocol version 2 
> 2007-07-24 09:53:57 Doing Diffie-Hellman group exchange 
> 2007-07-24 09:53:57 Doing Diffie-Hellman key exchange 
> 2007-07-24 09:53:57 Host key fingerprint is: 
> 2007-07-24 09:53:57 ssh-dss 1024 06:2a:c4:9c:e7:6a:f8:0d:5a:17:e9:b0:e3:79:1c:a5 
> 2007-07-24 09:53:57 Initialised AES-256 SDCTR client->server encryption 
> 2007-07-24 09:53:57 Initialised HMAC-SHA1 client->server MAC algorithm 
> 2007-07-24 09:53:57 Initialised AES-256 SDCTR server->client encryption 
> 2007-07-24 09:53:57 Initialised HMAC-SHA1 server->client MAC algorithm 
> 2007-07-24 09:54:06 Access granted 
> 2007-07-24 09:54:06 Opened channel for session 
> 2007-07-24 09:54:06 Requesting X11 forwarding 
> 2007-07-24 09:54:06 X11 forwarding enabled 
> 2007-07-24 09:54:06 Allocated pty (ospeed 38400bps, ispeed 38400bps) 
> 2007-07-24 09:54:06 Started a shell/command 
> 2007-07-24 09:54:17 Received X11 connect request from 127.0.0.1:53737 
> 2007-07-24 09:54:17 Opening X11 forward connection succeeded 
> 2007-07-24 09:54:17 Forwarded X11 connection terminated 
>  

-Michael S. Eubanks
 mse_software at charter.net