This is SwarmAgent Log:
21:30:23: Starting up SwarmAgent …
21:30:23: … registering SwarmAgent with remoting service
21:30:23: … registering SwarmAgent network channels
21:30:23: … initializing SwarmAgent
21:30:23: … certificate check has failed
21:30:23: … initializing cache
21:30:23: … using cache folder ‘D:/Work tool software/UE4/UnrealEngine/Engine/Saved/Swarm\SwarmCache’
21:30:23: … recreating SwarmAgent cache staging area
21:30:23: … initializing connection to SwarmCoordinator
21:30:23: … using SwarmCoordinator on RENDER-01
21:31:14: [Ping] Communication with the coordinator failed, job distribution will be disabled until the connection is established
21:31:14: … SwarmCoordinator failed to be initialized
21:31:14: … initializing local performance monitoring subsystem
21:31:15: … initialization successful, SwarmAgent now running
21:31:15: [Interface:TryOpenConnection] Local connection established
21:31:15: [Job] Accepted Job CFD6F3AA-44047FF0-F4F2229F-666C48BE
21:31:16: [Interface:CacheAllFiles] Failed to cache the executable: D:\Work tool software\UE4\UnrealEngine\Engine\Binaries\Win64\UnrealLightmass.exe
21:31:16: [Job] AddTask: Rejected, cannot add a task to a running job
21:31:16: [CloseConnection] Closing connection 72219499 using handle 72219499
21:31:16: [CloseConnection] Connection confirmed for disconnection 72219499
21:31:16: [CloseConnection] Closing orphaned Job (CFD6F3AA-44047FF0-F4F2229F-666C48BE)
21:31:16: [CloseConnection] Connection disconnected 72219499
21:31:16: [GetMessage] Safely returning to 72219499 with no message
21:31:16: [MaintainConnections] Local connection has closed (72219499)
21:31:16: [MaintainConnections] Removed connection 72219499
21:31:16: [MaintainConnections] All connections have closed