can't connect the cluster

Traceback (most recent call last):
File "/home/******, line 444, in connect
stream = await self.client.connect(
File "/home/******, line 275, in connect
af, addr, stream = await connector.start(connect_timeout=timeout)
asyncio.exceptions.CancelledError
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/******, line 490, in wait_for
return fut.result()
asyncio.exceptions.CancelledError
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/******, line 289, in connect
comm = await asyncio.wait_for(
File "/home/******, line 492, in wait_for
raise exceptions.TimeoutError() from exc
asyncio.exceptions.TimeoutError
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/******, line 83, in
main()
File "/home/******, line 57, in main
run_job(jobs)
File "/home/******, line 79, in run_job
method()
File "/home/******, line 16, in destroy_main
client = ClusterClient()
File "/home/******, line 43, in __init__
self.connect_existed_cluster(info)
File "/home/******, line 202, in connect_existed_cluster
self.client = Client(scheduler)
File "/home/******, line 938, in __init__
self.start(timeout=timeout)
File "/home/******, line 1096, in start
sync(self.loop, self._start, **kwargs)
File "/home/******, line 376, in sync
raise exc.with_traceback(tb)
File "/home/******, line 349, in f
result = yield future
File "/home/******, line 762, in run
value = future.result()
File "/home/******, line 1188, in _start
await self._ensure_connected(timeout=timeout)
File "/home/******, line 1250, in _ensure_connected
comm = await connect(
File "/home/******, line 315, in connect
raise OSError(
OSError: Timed out trying to connect to tls://182.10.9.78:18711 after 30 s

After a long time and a large amount of computing, i use another job reconnects to the schedule and releases the cluster. At this time, I cannot connect to the cluster, let alone release the cluster.