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Failed trying to connect to HPC: Error reading SSH protocol banner

After running MagFull application I obtained the following error :

[2018-10-25T08:24:40.127Z] Task failed 'hpc_plugin.tasks.prepare_hpc' -> Failed trying to connect to HPC: Error reading SSH protocol banner primary_hpc_ourtze (primary_hpc)
NonRecoverableError: Failed trying to connect to HPC: Error reading SSH protocol banner
    Traceback (most recent call last):
  File "/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/dispatch.py", line 641, in main
    payload = handler.handle()
  File "/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/dispatch.py", line 397, in handle
    result = self.func(*self.args, **kwargs)
  File "/opt/mgmtworker/env/plugins/default_tenant/MagFull_valid1_1014-hpc/lib/python2.7/site-packages/hpc_plugin/tasks.py", line 81, in prepare_hpc
    "Failed trying to connect to HPC: " + str(exp))
NonRecoverableError: Failed trying to connect to HPC: Error reading SSH protocol banner

[2018-10-25T08:24:40.867Z] 'install' workflow execution failed: RuntimeError: Workflow failed: Task failed 'hpc_plugin.tasks.prepare_hpc' -> Failed trying to connect to HPC: Error reading SSH protocol banner

What can I do ?

Thanks.

Failed trying to connect to HPC: Error reading SSH protocol banner

After running MagFull application I obtained the following error :

[2018-10-25T08:24:40.127Z] Task failed 'hpc_plugin.tasks.prepare_hpc' -> Failed trying to connect to HPC: Error reading SSH protocol banner primary_hpc_ourtze (primary_hpc)
NonRecoverableError: Failed trying to connect to HPC: Error reading SSH protocol banner
    Traceback (most recent call last):
  File "/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/dispatch.py", line 641, in main
    payload = handler.handle()
  File "/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/dispatch.py", line 397, in handle
    result = self.func(*self.args, **kwargs)
  File "/opt/mgmtworker/env/plugins/default_tenant/MagFull_valid1_1014-hpc/lib/python2.7/site-packages/hpc_plugin/tasks.py", line 81, in prepare_hpc
    "Failed trying to connect to HPC: " + str(exp))
NonRecoverableError: Failed trying to connect to HPC: Error reading SSH protocol banner

[2018-10-25T08:24:40.867Z] 'install' workflow execution failed: RuntimeError: Workflow failed: Task failed 'hpc_plugin.tasks.prepare_hpc' -> Failed trying to connect to HPC: Error reading SSH protocol banner

What can I do ?

Thanks.