# Can't make connection in client-server mode with MPI

**URL:** https://discourse.paraview.org/t/cant-make-connection-in-client-server-mode-with-mpi/3581
**Category:** ParaView Support
**Created:** [February 17, 2020, 12:04pm UTC](https://discourse.paraview.org/t/cant-make-connection-in-client-server-mode-with-mpi/3581 "2020-02-17T12:04:40Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![milky\_bread](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/m/ac8455/32.png) [@milky\_bread](https://discourse.paraview.org/u/milky_bread)
#### Post date: [February 17, 2020, 12:04pm UTC](https://discourse.paraview.org/t/cant-make-connection-in-client-server-mode-with-mpi/3581/1 "2020-02-17T12:04:40Z")

</div>

Dear Experts,  
I am in trouble when making connecting client-server mode with MPI with 5.7.0-Windows-MPI-Python3.7-msvc2015-64bit.

The server is windows 10, so I typed as below to launched pvserver with multithread,  
`mpiexec -n 12 pvserver.exe`

The server seems to be ready.  
`Waiting for client... Connection URL: cs://bdewx190362:11111 Accepting connection(s): bdewx190362:11111`

and try to make a connection from the client, but it failed with a following message.

`Client connected.  
( 26.188s) [pvserver.0]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (00000243E9F04EE0): failed to get wglChoosePixelFormatARB  
( 26.191s) [pvserver.0]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (00000243E9F04EE0): failed to get valid pixel format.  
( 26.193s) [pvserver.0]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (00000243E9F04EE0): GLEW could not be initialized: Missing GL version  
( 26.420s) [pvserver.6]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (000001427C0FB340): failed to get wglChoosePixelFormatARB  
( 26.422s) [pvserver.6]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (000001427C0FB340): failed to get valid pixel format.  
( 26.423s) [pvserver.6]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (000001427C0FB340): GLEW could not be initialized: Missing GL version  
( 26.449s) [pvserver.5]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (000001F6B2D8B030): failed to get wglChoosePixelFormatARB  
( 26.451s) [pvserver.5]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (000001F6B2D8B030): failed to get valid pixel format.  
( 26.452s) [pvserver.5]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (000001F6B2D8B030): GLEW could not be initialized: Missing GL version  
( 26.506s) [pvserver.8]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (0000020CADADD310): failed to get wglChoosePixelFormatARB  
( 26.508s) [pvserver.8]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (0000020CADADD310): failed to get valid pixel format.  
( 26.511s) [pvserver.8]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (0000020CADADD310): GLEW could not be initialized: Missing GL version  
( 26.526s) [pvserver.9]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (00000241ED74B6F0): failed to get wglChoosePixelFormatARB  
( 26.528s) [pvserver.9]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (00000241ED74B6F0): failed to get valid pixel format.  
( 26.530s) [pvserver.9]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (00000241ED74B6F0): GLEW could not be initialized: Missing GL version  
( 26.563s) [pvserver.4]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (0000018C6446C360): failed to get wglChoosePixelFormatARB  
( 26.565s) [pvserver.4]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (0000018C6446C360): failed to get valid pixel format.  
( 26.567s) [pvserver.4]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (0000018C6446C360): GLEW could not be initialized: Missing GL version  
( 26.558s) [pvserver.1]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (0000020CA08996E0): failed to get wglChoosePixelFormatARB  
( 26.560s) [pvserver.1]vtkWin32OpenGLRenderWin:742 ERR| v

(omission)

VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
VisRTX 0.1.6, using devices:  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
0: GeForce RTX 2070 SUPER (Total: 8.6 GB, Available: 7.0 GB)  
( 27.995s) [pvserver.0]vtkWin32OpenGLRenderWin:663 ERR| vtkWin32OpenGLRenderWindow (00000243EDA2F3F0): failed to get wglChoosePixelFormatARB  
( 27.998s) [pvserver.0]vtkWin32OpenGLRenderWin:742 ERR| vtkWin32OpenGLRenderWindow (00000243EDA2F3F0): failed to get valid pixel format.  
( 28.000s) [pvserver.0]vtkOpenGLRenderWindow.c:748 ERR| vtkWin32OpenGLRenderWindow (00000243EDA2F3F0): GLEW could not be initialized: Missing GL version

job aborted:  
[ranks] message

[0] process exited without calling finalize

[1-11] terminated

---- error analysis -----

[0] on BDEWX190362  
pvserver.exe ended prematurely and may have crashed. exit code 0xc0000005

---- error analysis -----`

What should I do to make a connection to the server with multithread?  
It go well with only one thread (just type _pvserver.exe_)

Sincerely,