Not able to execute the Test Set from Test Manger and Orchestrator getting error 'The proxy tunnel request to proxy 'http://127.0.0.1:9000/' failed with status code '403'." '

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Thanks Darshan for the solution, I will try above settings and let you know the status.
for Q2, to enable the Testing Runtime, I found below setting on forum, is this correct ? if not help me with steps
Unable To Allocate Testing Runtimes To The Machines Or Use Them To Execute Automations - News / Knowledge Base - UiPath Community Forum