... | ... | @@ -53,23 +53,33 @@ unset I_MPI_PMI_LIBRARY |
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mpirun -n $SLURM_NTASKS ./dice
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```
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## X11 Forwarding
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### On mac os : xquartz is mandatory to use X11 applications
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### On mac OS : **xquartz** is mandatory to use X11 applications
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**Symptom**
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On mac, impossible to use a graphic page
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When connecting on a server from a mac through `ssh licallo -X`, the X11 forwarding fails.
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**Solution**
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```
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xxx@dhcp20-65 ~ $ ssh -X xxx@licallo.oca.eu
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mfabian@hal7.oca.eu's password:
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Warning: untrusted X11 forwarding setup failed: xauth key data not generated
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[xxx@licallo ~]$ xeyes
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Error: Can't open display:
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```
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**Solution**
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(requires sudo privilege on the client)
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Edit the `/etc/ssh_config` file and add/changed line:
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```
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edit ssh_config
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add /changed line
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XAuthLocation /opt/X11/bin/xauth
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```
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**Explanation**
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explications :
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ssh -X should work since XQuartz, once enabled, uses xauth.
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he only problem is that ssh is looking for xauth in /usr/X11R6/bin and on macOS with XQuartz it is in /opt/X11/bin
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`ssh -X` should work since **XQuartz**, once enabled, uses xauth.
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he only problem is that *ssh* is looking for xauth in `/usr/X11R6/bin` instead of `/opt/X11/bin` as it is on macOS with **XQuartz**
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```
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source: https://stackoverflow.com/questions/27384725/ssh-x-warning-untrusted-x11-forwarding-setup-failed-xauth-key-data-not-gener
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[source](https://stackoverflow.com/questions/27384725/ssh-x-warning-untrusted-x11-forwarding-setup-failed-xauth-key-data-not-gener)
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