# Avoid client-server version mismatch
**URL:** https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584
**Category:** ParaView Support
**Created:** [October 16, 2020, 5:16pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584 "2020-10-16T17:16:21Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Francesc\_Costa](https://discourse.paraview.org/u/Francesc_Costa)
#### Post date: [October 16, 2020, 5:16pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/1 "2020-10-16T17:16:21Z")
Hello,
I have successfully built Paraview from source code in a Ubuntu machine. I have a Paraview Desktop native app with version:
Windows version: 5.8.1
When I try to connect the Windows Paraview Desktop with the remote ubuntu server I get an error mismatch.
I am planning to rebuild the ubuntu server so that I do not have this mismatch. What git tag version should I update my code to?
Thanks,
Francesc
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 19, 2020, 10:29am UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/2 "2020-10-19T10:29:00Z")
Which error do you have exactly ?
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### Author:  [@Francesc\_Costa](https://discourse.paraview.org/u/Francesc_Costa)
#### Post date: [October 19, 2020, 6:10pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/3 "2020-10-19T18:10:39Z")
In the client(windows):
ERROR: In C:\bbd\8fbebceb\build\superbuild\paraview\src\VTK\Parallel\Core\vtkSocketCommunicator.cxx, line 592
vtkSocketCommunicator (000001D7F58AAD50): Client/server version hash mismatch.
ERROR: In C:\bbd\8fbebceb\build\superbuild\paraview\src\Remoting\Core\vtkTCPNetworkAccessManager.cxx, line 333
vtkTCPNetworkAccessManager (000001D7EDDDB750):
* * *
Connection failed during handshake. vtkSocketCommunicator::GetVersion()
returns different values on the two connecting processes
(Current value: 100).
* * *
And in the ubuntu server:
( 282.183s) [pvserver]vtkSocketCommunicator.c:481 ERR| vtkSocketCommunicator (0x555a2fc3cde0): Client/server version hash mismatch.
( 282.183s) [pvserver]vtkTCPNetworkAccessMana:333 ERR| vtkTCPNetworkAccessManager (0x555a2fb10ce0):
* * *
Connection failed during handshake. vtkSocketCommunicator::GetVersion()
returns different values on the two connecting processes
(Current value: 100).
* * *
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 20, 2020, 8:51am UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/4 "2020-10-20T08:51:25Z")
Are you building ParaView 5.8.1 on your ubuntu machine ?
@wascott: We really need to improve the error handling in this case.
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### Author:  [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [October 21, 2020, 12:11am UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/5 "2020-10-21T00:11:12Z")
[https://gitlab.kitware.com/paraview/paraview/-/issues/18171](https://gitlab.kitware.com/paraview/paraview/-/issues/18171)
---
### Author:  [@Francesc\_Costa](https://discourse.paraview.org/u/Francesc_Costa)
#### Post date: [October 21, 2020, 4:47pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/6 "2020-10-21T16:47:38Z")
I built 5.8.1-1432-g4dbd3922cd in Ubuntu
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 21, 2020, 4:53pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/7 "2020-10-21T16:53:02Z")
You should build the exact same version.
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### Author:  [@Francesc\_Costa](https://discourse.paraview.org/u/Francesc_Costa)
#### Post date: [October 21, 2020, 5:22pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/8 "2020-10-21T17:22:32Z")
Ok, both are 5.8.1. I understand you mean the fourth number in the version that in Windows in the about is not shown.
Even when I go to the download page, for Windows I only see 5.8.1 with and without MPI while in Ubuntu I see more versions 5.8.1.x versions.
So, what version of Ubuntu should I install that it matches Windows 5.8.1?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 21, 2020, 5:25pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/9 "2020-10-21T17:25:54Z")
just use the 5.8.1 release for both.
5.8.1-1432-g4dbd3922cd is not a release, it is a nightly.
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### Author:  [@Francesc\_Costa](https://discourse.paraview.org/u/Francesc_Costa)
#### Post date: [October 22, 2020, 3:59pm UTC](https://discourse.paraview.org/t/avoid-client-server-version-mismatch/5584/10 "2020-10-22T15:59:10Z")
Thanks Mathieu!
It is working now.
Francesc