[Python] Trouble while launching Mainframe Terminal TN3270.ws via Python

I am currently working on a Python-based automation task that involves interacting with a mainframe terminal. As part of the requirement, I need to:

1. Launch the mainframe terminal.
2. Enter the username and password.
3. Perform a series of interactions (e.g., pressing specific keys).
4. Extract data from the terminal screen.

To achieve this, I attempted to use the py3270 library by specifying the hostname and port. However, I am encountering the following error:

[WinError 10061] No connection could be made because the target machine actively refused it
​

Below is the code snippet I am using:

from py3270 import Emulator

# Launch the terminal with visibility enabled
em = Emulator(visible=True)

# Attempt to connect to the mainframe host
print("Connecting to mainframe...")
em.connect('HostNameortNumber')
print("Connection established.")


What is causing this issue?

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