# pvserver with MPI --- reverse connection always refused

**URL:** https://discourse.paraview.org/t/pvserver-with-mpi-reverse-connection-always-refused/4796
**Category:** ParaView Support
**Created:** [July 9, 2020, 7:41pm UTC](https://discourse.paraview.org/t/pvserver-with-mpi-reverse-connection-always-refused/4796 "2020-07-09T19:41:46Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Windrocer](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/6a8cbe/32.png) [@Windrocer](https://discourse.paraview.org/u/Windrocer)
#### Post date: [July 9, 2020, 7:41pm UTC](https://discourse.paraview.org/t/pvserver-with-mpi-reverse-connection-always-refused/4796/1 "2020-07-09T19:41:46Z")

</div>

Hello there,

I met some problems in connecting to pvserver parallelly running on a cluster. The cluster is Unix system while my ParaView client is on Windows 10.

I tried to run pvserver serially on the cluster and the reverse-connection is successful. When I switched to command

```
mpiexec pvserver --reverse-connection --client-host=xx.xx.xx.xx ,

```

I got errors like:

```
( 1.848s) [pvserver.0] vtkSocket.cxx:447 ERR|vtkClientSocket (0xacd0f0): Socket error in call to connect. Connection refused.

```

The connection with serial pvserver works fine so I guess it is not the setup problems. Any idea on what’s going wrong?

My ParaView client information is as:

 ![paraview_info](https://discourse.paraview.org/uploads/default/original/2X/5/506977f75844301f85f58c990014de10cf0de0ed.png)

Thanks in advance for any comments.

Eric