Thanks for answer

I tried your first recommendation in my run of VirtualGL to force
Pbuffer rendering

I made the changes in the steps 4 and 5 adding the variable DISPLAY=:0

 4. I connect by ssh to pc1 and run crserver


     ssh-XY clust...@192.168.1.11


     export VGL_READBACK=0 DISPLAY=:0


     vglrun crserver

 5. I connect by ssh to pc2 and run crserver


     ssh-XY clust...@192.168.1.12


     export VGL_READBACK=0 DISPLAY=:0

     vglrun crserver


About the second recommendation when I installed VirtualGL I ran
vlgserver_config and answered to the configuration NO in the three
questions

Restrict local X server access to vglusers group (recommended)?
[Y/n] n

Restrict framebuffer device access to vglusers group (recommended)?
[Y/n] n

Disable XTEST extension (recommended)?
[Y/n] n


When I ran all to proof these changes

The pc1 and pc2 shows these messages


In pc1


     [clust...@pc1 ~]$ export VGL_READBACK=0 DISPLAY=:0


     [clust...@pc1 ~]$ vglrun crserver


     [VGL] ERROR: Could not open display :0.




 In pc2


     [clust...@pc2 ~]$ export VGL_READBACK=0 DISPLAY=:0


     [clust...@pc2 ~]$ vglrun crserver


     [VGL] ERROR: Could not open display :0.


Please help me I am researching about this problem but I don't find the solution
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