# Client / Server configuration
**URL:** https://discourse.paraview.org/t/client-server-configuration/69
**Category:** ParaView Support
**Created:** [June 3, 2018, 11:53pm UTC](https://discourse.paraview.org/t/client-server-configuration/69 "2018-06-03T23:53:46Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@jam68](https://discourse.paraview.org/u/jam68)
#### Post date: [June 3, 2018, 11:53pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/1 "2018-06-03T23:53:47Z")
Hello,
I am using ParaView with OpenFOAM. I have just changed over to using OpenFOAM in a Docker container.
My configuration is a remote server on which I have OpenFOAM running in Docker. I am running pvserver in the container and want to run ParaView on my Mac workstation across a network. I am trying to set up the client/server to connect ParaView to pvserver in the container. I can only access the server from the Mac via SSH.
How do I configure to connect ParaView to the pvserver from the Mac to the server and then across into the container.
Thanks,
Joe.
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### Author:  [@jam68](https://discourse.paraview.org/u/jam68)
#### Post date: [June 5, 2018, 12:10am UTC](https://discourse.paraview.org/t/client-server-configuration/69/2 "2018-06-05T00:10:41Z")
I was able to make some progress.
I was able to traverse the network with the following command in the docker container (note that the docker container is running on Ubuntu 16.04 LTS)::
pvserver -rc --client-host=25.92.7.188 --server-port=20010 --use-offscreen-rendering
The server side gives the following error:
Connecting to client (reverse connection requested)…
Connection URL: csrc://25.92.7.188:20010
ERROR: In /home/ubuntu/OpenFOAM/ThirdParty-dev/ParaView-5.4.0/ParaViewCore/ClientServerCore/Core/vtkTCPNetworkAccessManager.cxx, line 315
vtkTCPNetworkAccessManager (0x12f2900): Failed to connect to 25.92.7.188:20010
ERROR: In /home/ubuntu/OpenFOAM/ThirdParty-dev/ParaView-5.4.0/ParaViewCore/ClientServerCore/Core/vtkTCPNetworkAccessManager.cxx, line 328
vtkTCPNetworkAccessManager (0x12f2900):
* * *
Connection failed during handshake. This can happen for the following reasons:
1. Connection dropped during the handshake.
2. vtkSocketCommunicator::GetVersion() returns different values on the
two connecting processes (Current value: 100).
3. ParaView handshake strings are different on the two connecting
processes (Current value: paraview.5.4.renderingbackend.opengl).
* * *
On the paraview client I get the following error (note that the client is 5.4.0 on a Mac OSX):
ERROR: In /Users/kitware/buildbot-slave/8275bd07/source-paraview/ParaViewCore/ClientServerCore/Core/vtkTCPNetworkAccessManager.cxx, line 413
vtkTCPNetworkAccessManager (0x60000046fd40):
* * *
Connection failed during handshake. This can happen for the following reasons:
1. Connection dropped during the handshake.
2. vtkSocketCommunicator::GetVersion() returns different values on the
two connecting processes (Current value: 100).
3. ParaView handshake strings are different on the two connecting
processes (Current value: paraview.5.4.renderingbackend.opengl2).
* * *
I am not sure if this is a compilation error or if it has something to do with the system attempting to render on the headless server. Any thoughts?
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### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [June 5, 2018, 3:14am UTC](https://discourse.paraview.org/t/client-server-configuration/69/3 "2018-06-05T03:14:15Z")
The good news is that the server and client are talking. The bad news is that it looks like your `pvserver` was built with the OpenGL backend (Current value: paraview.5.4.renderingbackend.opengl) while your client was built with the OpenGL2 backend (Current value: paraview.5.4.renderingbackend.opengl2). These need to both be built with the same backend. OpenGL2 is the modern backend, so I would recommend rebuilding `pvserver` with the OpenGL2 backend and trying again.
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### Author:  [@jiri](https://discourse.paraview.org/u/jiri)
#### Post date: [December 11, 2018, 4:00pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/4 "2018-12-11T16:00:31Z")
> [@cory.quammen](#):
>
> so I would recommend rebuilding `pvserver` with the OpenGL2 backend
Can you tell me, please, how exactly should I do the rebuilding? I am trying to build a pvserver in a Linux subsystem for Windows (WSL) and connect to it using ParaView installed directly on Windows. I keep getting the same error message. Is there a way how to overcome this?
---
### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [December 11, 2018, 4:17pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/5 "2018-12-11T16:17:36Z")
> [@jiri](#):
>
> I am trying to build a pvserver in a Linux subsystem for Windows (WSL) and connect to it using ParaView installed directly on Windows.
That’s a new configuration I haven’t encountered yet. Are you building the client as well? If so, are you building from the same source code?
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### Author:  [@jiri](https://discourse.paraview.org/u/jiri)
#### Post date: [December 11, 2018, 5:37pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/6 "2018-12-11T17:37:38Z")
I am not sure I understand. When using WSL, where I have installed ParaView 5.4.1., I simpy set pvserver with particular server port and then I try to connect to it using ParaView 5.4.1 installed directly in Windows, that is NOT under WSL. But when I try to connect to the pvserver I get the same error message. Could it be that ParaView in Linux uses OpenGL as a rendering backend, whereas ParaView in Windows uses OpenGL2?
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### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [December 11, 2018, 5:46pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/7 "2018-12-11T17:46:42Z")
You said you are building a pvserver, which I take to mean you are compiling ParaView. In the CMake configuration, check to see the value of `VTK_RENDERING_BACKEND`. It should be `OpenGL2`.
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### Author:  [@jiri](https://discourse.paraview.org/u/jiri)
#### Post date: [December 13, 2018, 2:39pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/8 "2018-12-13T14:39:43Z")
Thank you for your answers. The rendering backend was different for each of the versions. Problem was, that I installed ParaView on Ubuntu using repository version of the program (via apt-get install) which is implicitly using OpenGL as a rendering backend. But on the webpages of ParaView, there is also a version for Linux with the OpenGL2 backend, so I downloaded the tarball, extracted it and know everything works just fine.
My best regards
Jiri
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### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [December 13, 2018, 3:39pm UTC](https://discourse.paraview.org/t/client-server-configuration/69/9 "2018-12-13T15:39:58Z")
Great, I’m glad it’s working. Thanks for following up.