python fastapi windows-server-2016 uvicorn mcafee

OSError: [WinError 64] The specified network name is no longer available (FastAPI + Windows Server 2016 + MS SQL)

I am running a Python (FastAPI + Uvicorn) webserver on a Windows Server 2016 VM.

My application start command - uvicorn.exe main:app --port 443 --host 0.0.0.0 --ssl-keyfile PATH_TO_KEY.PEM --ssl-certfile PATH_TO_CERT.PEM

I am serving the request over HTTPS.

Although the webserver works fine, Occasionally, on some random request, it throws an OSError: [WinError 64] The specified network name is no longer available in the Powershell. And I would need to restart the entire application to start serving requests again.

OS Config:

Windows Server 2016 (Version 1607, Build 14393.6167)
McAfee AV + Windows Defender
Connecting to MS SQL DB (different server) over ODBC 17 driver.

Stack trace -

Task exception was never retrieved
future: <Task finished name='Task-423' coro=<IocpProactor.accept.<locals>.accept_coro() done, defined at C:\Users\USERNAME
\AppData\Local\Programs\Python\Python311\Lib\asyncio\windows_events.py:597> exception=OSError(22, 'The specified network name
is no longer available', None, 64, None)>
Traceback (most recent call last):
  File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python311\Lib\asyncio\windows_events.py", line 600, in accept_coro
    await future
  File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python311\Lib\asyncio\windows_events.py", line 772, in _register
    value = callback(None, None, ov)
            ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python311\Lib\asyncio\windows_events.py", line 589, in finish_acce
pt
    ov.getresult()
OSError: [WinError 64] The specified network name is no longer available
Accept failed on a socket
socket: <asyncio.TransportSocket fd=936, family=2, type=1, proto=6, laddr=('0.0.0.0', 443)>
Traceback (most recent call last):
  File "C:\Users\USERNAME\AppData\Local\Programs\Python\Python311\Lib\asyncio\proactor_events.py", line 843, in loop
    conn, addr = f.result()
                 ^^^^^^^^^^
OSError: [WinError 64] The specified network name is no longer available

I know it's hard to say what the issue is, But any troubleshooting/debugging tools, or software I can use, please let me know.

Articles say this issue is anti-virus related. My IT team is hesitant to disable the AntiVirus without proper proof. Could it be something else?

Solution

Unbeknownst to me, Powershell has the "QuickEdit" and "Insert" Mode turned on which was causing my application to freeze every time I clicked on the Powershell window which was causing network-related issues.

Turning the QuickEdit and Insert mode off worked for me and I don't get that WinError 64 issue anymore.