Here's how it works when I connect to a Unix/Linux box via Openssh under Cygwin on a Windows box. On the Windows box I define an env variable, 'export DISPLAY="localhost:0.0"'. In my ssh_config I've defined: Compression yes ForwardAgent yes ForwardX11 yes Protocol 2 KeepAlive yes On the sshd (Linux) end, in my sshd_config I've defined: X11Forwarding yes X11DisplayOffset 10 X11UseLocalhost yes KeepAlive yes UseLogin no UsePrivilegeSeparation yes Compression yes
On the Windows box I start an X11 server, either the one that comes with Cygwin's port of XFree86 or something like Hummingbird Exceed. Then, 'ssh -2 -X -C user@xxxxxxxxxxxxxxx' to open a Bash shell. In the Bash shell DISPLAY will be automatically defined as something like 'DISPLAY=localhost:10.0'. Then I can just run '/usr/bin/X11/xterm &' and an xterm window will open up on my PC, with the X11 connection tunneling thru the secure connection with compression turned on to make it a little less painfully slow. 'Netstat -a' should show that port 6000 traffic is mapped to localhost, not the external port.
I know it's working properly because the Unix or Linix host is behind a firewall which blocks port 6000, plus my PC runs a firewall that also blocks port 6000.
Hope this helps.
Doug Wyatt
Chen Yabing wrote:
I am just confused with what X11 forwarding can do. suppose that I start Putty on my windows machine and connect to my linux server using ssh. then how can I use it? Does X11 forwarding can allow me to call X applications on the linux server so that they run on my windowns machine?
----- Original Message ----- From: "Ted Zlatanov" <tzz@xxxxxxxxxxxx> To: <psyche-list@xxxxxxxxxx> Sent: Friday, May 23, 2003 2:46 AM Subject: Re: how to use X11 forwarding
On Thu, 22 May 2003, chenyabi@xxxxxxxxxxxxxxx wrote:
I want to use xwin32 to connect my linux server from my windows workstation. but I do not want clear text transmitted over the network. it seems X11 forwarding can encrypt the data over such connections. anybody can tell me how to use it practically?
The development version of Putty, and quite a few other SSH clients for Windows, support X11 forwarding back to the Windows machine.
Note that the Windows machine running XWin32 is called the "X server" and the Linux machine is your "X client." The terminology can be confusing.
Ted
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Doug Wyatt <dwyatt@xxxxxxxxxxxxxxxxxx> Sys Admin - Kohlman Systems Research, Inc. 319 Perry St., Lawrence, KS 66044 USA Phone: 785-843-4099 Fax: 785-843-6459
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