Running an X-Session via SSH on Linux

Any Please note: any firewall between the HP-UX and the X-Server system must allow the SSH connection between the two systems.

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Perform the following steps to start an Xsession via SSH.

	Step	Command
1	Start Xephyr.	`$ Xephyr :20 -ac -screen 950x540` Parameters: :20 - the DISPLAY variable is set to :20 -ac - no access control to the X-Server -screen - the dimensions of the X-display (example only) For more information refer to the man-pages of your Linux system.
2	Start an xterm inside Xephyr and create a SSH connection to HP-UX.	`$ xterm -display :20 \` `-e ssh -Yf <user@hp-ux-ip-address> /usr/dt/bin/Xsession`
3	Wait for the password prompt inside the xterm window and enter the password for the HP-UX user.
4	An X-Session for the user will open in the Xephyr window.

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Before using the X-server, XDMCP must be enabled on the guest system. XDMCP allows the HP-UX dtlogin screen to be displayed on remote X-Servers upon request of the X-Server.

Any Please note: Any intermediate firewall must allow access to UDP port 177 on HP-UX, and to TCP ports 6000~60xx from the remote host to your PC (depending on the X-Server settings).

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Perform the following steps to enable XDMCP on HP-UX:

Step Description

1 Create a system-specific copy of the Xconfig file # cp /usr/dt/config/Xconfig /etc/dt/config/Xconfig

2

Enable XDMCP.

Edit the file:

# vi /etc/dt/config/Xconfig

Locate the following line and insert a comment character, '#', at the beginning of the line.
Dtlogin.requestPort: 0

Save the file.

3

Restart the X-server.

# /sbin/init.d/dtlogin.rc stop # /sbin/init.d/dtlogin.rc start

(If there is no dtlogin.rc file in /sbin/init.d, you first have to run
/usr/dt/bin/dtconfig -e )

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To configure and activate the fontserver on HP-UX, perform the following steps:

Step Command

1

Include the CDE fonts in the fontserver's catalog.

Use a text editor to open the file

/etc/X11/fs/config

If not already there, append

,/usr/dt/config/xfonts/C

to the end of the line beginning with

catalogue =

2

Enable the automatic start of the fontserver at boot.

Use a text editor to open the file

/etc/rc.config.d/xfs

If not already set, set the following variable to 1:

RUN_X_FONT_SERVER=1

3

(Re)start the fontserver.

# /sbin/init.d/xfs stop

# /sbin/init.d/xfs start

4

Test if the fontserver responds to queries.

Enter the following command on the system running the X-Server:

$ fslsfonts -server <font-server-ip>:7000 -fn '-dt*' | head

This should produce output similar to the following:

Code Block

language	text
theme	Eclipse

-dt-application-bold-i-normal-sans-10-100-75-75-p-60-hp-roman8
-dt-application-bold-i-normal-sans-10-100-75-75-p-60-iso8859-1

By Please note: By default, the fontserver runs on port 7000. This port must be allowed through any intermediate firewalls.

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Copying Missing Fonts to a Linux X-Server

This Please note: This should only be attempted, if the use of a fontserver is not possible for some reason.

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Perform the following steps to start an Xsession via XDMCP.

Step Command

1

Start Xephyr.

Use local font directories:

$ Xephyr :20 -ac -screen 950x540 -query <hp-ux-guest-ip> \ -fp <new-font-directory1>, <new-font-directory2>,...

Use fontserver:

$ Xephyr :20 -ac -screen 950x540 -query <hp-ux-guest-ip> \ -fp tcp/<hp-ux-guest-ip>:7000/all

Parameters:

:20 - the DISPLAY variable is set to :20
-ac - no access control to the X-Server
-screen - the dimensions of the X-display (example only)
-query - requests an XDMCP session from the HP-UX guest
-fp - add the local fontpath for the required fonts or a fontserver

For more information refer to the man-pages of your Linux system.

2

A CDE login window will appear in the Xephyr window.

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This section shows how to use Xming to connect to a HP-UX guest system using XDMCP.

	Step	Description
1	Start XLaunch from the Xming section in the Start menu. Make sure that Xming is not already running before you start
2	Select the option One Window. This is one of the options supporting XDMCP. Press Next to continue
3	Select XDMCP for the session. Press Next to continue.
4	Enter the IP address or hostname of the virtual HP-UX system. Press Next to continue.
5	Finish the setup by continuing through the remainder of the sections (for this example all the defaults were accepted) and press Finish on the last configuration screen of XLaunch.
6	The HP-UX graphical login screen is displayed and after logging in, you will see the graphical desktop.