python -m flask run gives OSError: [WinError 10013] An attempt was made to access a socket in a way forbidden by its access permissions

[chandrakantrvce]

BPO	44767
Nosy	@loewis, @terryjreedy, @pitrou, @ericvsmith, @tjguk
Files	app.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-07-31.01:34:10.062>
created_at = <Date 2021-07-28.18:46:29.413>
labels = ['invalid', 'type-bug', 'library', '3.9']
title = 'python -m flask run gives OSError: [WinError 10013] An attempt was made to access a socket in a way forbidden by its access permissions'
updated_at = <Date 2021-07-31.01:34:10.060>
user = 'https://bugs.python.org/chandrakantrvce'

bugs.python.org fields:

activity = <Date 2021-07-31.01:34:10.060>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2021-07-31.01:34:10.062>
closer = 'terry.reedy'
components = ['Library (Lib)']
creation = <Date 2021-07-28.18:46:29.413>
creator = 'chandrakant.rvce'
dependencies = []
files = ['50189']
hgrepos = []
issue_num = 44767
keywords = []
message_count = 3.0
messages = ['398413', '398414', '398617']
nosy_count = 7.0
nosy_names = ['loewis', 'terry.reedy', 'pitrou', 'eric.smith', 'tim.golden', 'Jimbofbx', 'chandrakant.rvce']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44767'
versions = ['Python 3.9']

[chandrakantrvce]

Attached is teh app.py program. I tried runnign it in VS Code via the cmd - python -m flask run. It gives me the below error

OSError: [WinError 10013] An attempt was made to access a socket in a way forbidden by its access permissions

Tried changing the port and executing it still no luck

[ericvsmith]

This sounds like a flask problem, not a python bug.

[terryjreedy]

This tracker is for fixing bugs in CPython and its stdlib, not for bugs in 3rd party applications or their usage. Your report does not point to a bug in python itself.

Try asking about this issue on a flask forum, python-list, maybe stackoverflow.com, or maybe elsewhere. When you do, cut and paste the full traceback. Also clarify whether you ran 'python -m flask run' at a command line or simulation thereof or whether you loaded app.py into VS Code and ran the file. Those are different actions.