WinError 10060尝试使用Python PySFTP模块连接到远程服务器时出错

我正在尝试连接到远程服务器，并使用以下代码列出路径内的文件：

import pysftp

myHostname = "myhostname.com"
myPort = <someportnumber>
myUsername = "<valid username>"
myPassword = "<valid password>"

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None

with pysftp.Connection(host=myHostname, username=myUsername, password=myPassword, cnopts= cnopts, port=myPort) as sftp:
    print("Connection succesfully established ... ")

    sftp.chdir('/logs/dev')

    # Obtain structure of the remote directory
    directory_structure = sftp.listdir_attr()

    # Print data
    for attr in directory_structure:
        print(attr.filename, attr)

但是，当我运行它时，它无法建立连接。它抛出以下异常：

Traceback (most recent call last):
  File "c:/Users/611841191/Documents/SFTP File Download/SFTPFileDownload.py", line 11, in <module>
    with pysftp.Connection(host=myHostname, username=myUsername, password=myPassword, cnopts= cnopts, port=myPort) as sftp:
  File "C:\Users\611841191\AppData\Roaming\Python\Python38\site-packages\pysftp\__init__.py", line 140, in __init__
    self._start_transport(host, port)
  File "C:\Users\611841191\AppData\Roaming\Python\Python38\site-packages\pysftp\__init__.py", line 176, in _start_transport
    self._transport = paramiko.Transport((host, port))
  File "C:\Users\611841191\AppData\Roaming\Python\Python38\site-packages\paramiko\transport.py", line 415, in __init__
    raise SSHException(
paramiko.ssh_exception.SSHException: Unable to connect to <myhostname.com>: [WinError 10060] A connection attempt failed because the connected party did not properly respond after a period of time or established connection failed because connected host has failed to respond 

有人可以帮我解决为什么因为我尝试过其他远程服务器而抛出此异常的原因，而这些代码对于它们来说似乎工作正常？该代码仅对一台特定的远程服务器抛出异常。