Client Data render server setup issue: rendering not working as intended

I am trying to setup a client data render server setup. Having two seperate servers for data and rendering. however, an error shows up while viewing the volume

( 90.098s) [pvrenderserver.0] vtkPVRenderView.cxx:2043 ERR| vtkPVRenderView (0x1af60a0): Some of the representations in this view require remote rendering which, however, is not available. Rendering may not work as expected.

hence, the rendering won’t happen on the rendering server. I would appreciate your help to fix this issue