Differences

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--- other:x_conf [2022/08/08 15:41] – [If you are connecting with ssh] jypeter
+++ other:x_conf [2022/08/08 17:41] – [Nothing works!] Added error messages examples jypeter
@@ Line 82: / Line 82: @@
 ===== Configuration on the remote Linux server =====
-==== If you are connecting with ssh ====
+==== If you are connecting with ssh or PuTTY ====
 Nothing special to do, if you are using [[other:ssh#using_an_x_server_to_display_graphics|"ssh -X" or "ssh -Y"]] or ''PuTTY'' to connect to a remote Linux server
@@ Line 88: / Line 88: @@
 ==== If you are using WSL ====
-If you have installed [[other:win10wsl|WSL+Ubuntu]] on your local machine, and you need your //X server// to display local graphics generated in WSL, you need to **define the ''DISPLAY'' variable** in your terminal:
+You need to know what you consider as the //Local machine//, and what is the //Remote server//
-  * //bash// shell: ''export DISPLAY=localhost:0.0''
-  * //tcsh// shell: ''setenv DISPLAY localhost:0.0''
+  * **Local machine**: your local **Windows computer**, where you have installed [[other:win10wsl|WSL+Ubuntu]]
-  * You probably want to define the ''DISPLAY'' variable automatically in one of the shell configuration files
+  * **Remote server** : we consider 2 types of remote servers:
+    * an **actual remote server**
+    * The **WSL computer** running on a **virtual machine inside your local Windows computer**. This can be considered as a different and //remote// computer, even it is running on the local computer\\ You need your local //X server// to display graphics generated in WSL
+    * **Define the ''DISPLAY'' variable** in the terminals used in WSL:
+      * //bash// shell: ''export DISPLAY=localhost:0.0''
+      * //tcsh// shell: ''setenv DISPLAY localhost:0.0''
+      * You probably want to define the ''DISPLAY'' variable automatically in one of the shell configuration files
@@ Line 164: / Line 171: @@
 ==== On a Windows computer with WSL+Linux and an X server installed ====
+We assume that [[other:win10wsl|WSL+Ubuntu]] is installed and that the ''DISPLAY'' variable is [[other:x_conf#if_you_are_using_wsl|configured correctly]]
-  * FIXME ''export DISPLAY=localhost:0.0''
+Open a WSL terminal (you should know how, if you have installed WSL) and type some basic commands
+<code>[Local WSL] $ hostname
+name_of_your_local_machine
+[Local WSL] $ echo $DISPLAY
+localhost:0.0
+[Local WSL] $ xterm
+[Local WSL] $ ssh -X some_login@some_remote_server
+[some connection information skipped here]
+[Remote] $ echo $DISPLAY
+localhost:22.0
+[Remote] $ xterm</code>
 ===== Troubleshooting =====
@@ Line 179: / Line 198: @@
   * Have you configured [[other:putty_conf|PuTTY]] and/or other required applications correctly ?
   * Is the ''DISPLAY'' variable defined correctly on the local and remote computer?
+=== When DISPLAY is not defined correctly ===
+If the ''DISPLAY'' **variable is not defined (correctly)**, you will get a ''Can't open display: //[NO VALUE DISPLAYED HERE]//'' error
+<code>$ xterm &
+$ xterm: Xt error: Can't open display:
+xterm: DISPLAY is not set
+$ echo $DISPLAY
+</code>
+=== When there is no X server running ===
+If the ''DISPLAY'' variable is defined, but there is **no X server**, you will get a ''Can't open display: localhost://[SOME VALUE]//'' error\\ <code>$ xterm &
+$ connect localhost port 6000: Connection refused
+xterm: Xt error: Can't open display: localhost:12.0</code>
 ==== OpenGL related settings ====