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Unreal MRQ - 3 out of 4 rendernodes failing with a RenderPluginException (due to 'Waiting on client connection..')

All nodes attempt to run the job , but 3/4 of them fail with a RenderPluginException

Failing nodes do not get past : Waiting on client connection..
Succeeding node shows : Server connection established! , Client connection established!!

=======================================================
Error
=======================================================
Error: LogPython: Error: Could not load Python file 'C:/Program Files/Epic Games/UE_5.3/Engine/Binaries/Win64/mrq_rpc.py' (resolved from 'mrq_rpc.py')
   at Deadline.Plugins.PluginWrapper.RenderTasks(Task task, String& outMessage, AbortLevel& abortLevel)

=======================================================
Type
=======================================================
RenderPluginException

=======================================================
Stack Trace
=======================================================
   at Deadline.Plugins.SandboxedPlugin.d(DeadlineMessage bgq, CancellationToken bgr)
   at Deadline.Plugins.SandboxedPlugin.RenderTask(Task task, CancellationToken cancellationToken)
   at Deadline.Slaves.SlaveRenderThread.c(TaskLogWriter ajv, CancellationToken ajw)

the nodes that fail look like this :

...
2024-08-08 23:12:26:  0: INFO: Waiting on client connection..
2024-08-08 23:12:26:  0: WARNING: Warning: Asset Registry is still loading. The DeadlineService plugin will be loaded after the Asset Registry is complete.
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.24:774][  1]LogPython: Warning: Asset Registry is still loading. The DeadlineService plugin will be loaded after the Asset Registry is complete.
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:115][  1]LogPython: Asset Registry is complete. Loading DeadlineService plugin.
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:147][  1]Running Python start-up script 'D:/P4/TSWHALE/TSWHALE-Env-dev/UE/Plugins/UnrealDeadlineService/Content/Python/init_unreal.py': 0.473809 secs
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:150][  1]Running Python start-up script 'C:/Program Files/Epic Games/UE_5.3/Engine/Plugins/Importers/USDImporter/Content/Python/init_unreal.py': 0.000107 secs
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:154][  1]Running Python start-up script 'C:/Program Files/Epic Games/UE_5.3/Engine/Plugins/MovieScene/MovieRenderPipeline/Content/Python/init_unreal.py': 0.001854 secs
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:162][  1]LogPython: registering <class 'ControlRigWorkflows.workflow_deformation_rig_preset.provider'>
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:170][  1]Running Python start-up script 'D:/P4/TSWHALE/TSWHALE-Env-dev/UE/Plugins/ControlRig/Content/Python/init_unreal.py': 0.014851 secs
2024-08-08 23:12:26:  0: STDOUT: [2024.08.08-22.12.25:173][  1]LogPython: Error: Could not load Python file 'C:/Program Files/Epic Games/UE_5.3/Engine/Binaries/Win64/mrq_rpc.py' (resolved from 'mrq_rpc.py')
2024-08-08 23:12:26:  0: Done executing plugin command of type 'Render Task'

the node that works looks like this :

...
2024-08-08 23:13:30:  0: PYTHON: Server connection established!
2024-08-08 23:13:31:  0: INFO: Client connection established!!
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.29:741][  1]Running Python start-up script 'D:/P4/TSWHALE/TSWHALE-Env-dev/UE/Content/Python/init_unreal.py': 0.000132 secs
2024-08-08 23:13:31:  0: WARNING: Warning: Asset Registry is still loading. The DeadlineService plugin will be loaded after the Asset Registry is complete.
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.29:759][  1]LogPython: Warning: Asset Registry is still loading. The DeadlineService plugin will be loaded after the Asset Registry is complete.
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:450][  1]LogPython: Asset Registry is complete. Loading DeadlineService plugin.
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:456][  1]Running Python start-up script 'D:/P4/TSWHALE/TSWHALE-Env-dev/UE/Plugins/UnrealDeadlineService/Content/Python/init_unreal.py': 0.713899 secs
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:477][  1]Running Python start-up script 'D:/P4/TSWHALE/TSWHALE-Env-dev/UE/Plugins/MoviePipelineDeadline/Content/Python/init_unreal.py': 0.010469 secs
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:482][  1]Running Python start-up script 'C:/Program Files/Epic Games/UE_5.3/Engine/Plugins/Importers/USDImporter/Content/Python/init_unreal.py': 0.000138 secs
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:487][  1]Running Python start-up script 'C:/Program Files/Epic Games/UE_5.3/Engine/Plugins/MovieScene/MovieRenderPipeline/Content/Python/init_unreal.py': 0.001713 secs
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:501][  1]LogPython: registering <class 'ControlRigWorkflows.workflow_deformation_rig_preset.provider'>
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:504][  1]Running Python start-up script 'D:/P4/TSWHALE/TSWHALE-Env-dev/UE/Plugins/ControlRig/Content/Python/init_unreal.py': 0.014225 secs
2024-08-08 23:13:31:  0: STDOUT: [2024.08.08-22.13.30:573][  1]LogPython: Connecting to rpc server on port `52498`
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