PolarDB这个问题怎么解决？

PolarDB这个问题怎么解决？Traceback (most recent call last):
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/deployer/pxc/polardbx_cluster.py", line 304, in _check_docker_engine_version
client = DockerManager.get_client(host)
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/deployer/core/docker_manager.py", line 42, in get_client
client = docker.DockerClient(base_url=docker_url, timeout=60, max_pool_size=100)
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/docker/client.py", line 45, in init
self.api = APIClient(args, *kwargs)
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/docker/api/client.py", line 173, in init
max_pool_size=max_pool_size, shell_out=use_ssh_client
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/docker/transport/sshconn.py", line 180, in init
self._connect()
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/docker/transport/sshconn.py", line 225, in _connect
self.ssh_client.connect(self.ssh_params)
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/paramiko/client.py", line 349, in connect
retry_on_signal(lambda: sock.connect(addr))
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/paramiko/util.py", line 283, in retry_on_signal
return function()
File "/data/polardbx/polarx/polardbx-install/venv/lib64/python3.6/site-packages/paramiko/client.py", line 349, in
retry_on_signal(lambda: sock.connect(addr))
TimeoutError: [Errno 110] Connection timed out
这个可能是哪里的问题？
免密已开通、docker也已经安装，SSH端口5631，防火墙未关闭（不能关闭）