[Django] What should I do if python manage.py runserver has been working normally before but suddenly fails to run?

Problem:
I have edited the same Django project multiple times before, but after a few days, when I run python manage.py runerver on the command line, it has been stuck, and there is no response when I use Ctrl+C.

Solution:
Turn off the computer first After the firewall runs python manage.py runserver

and closes it, it runs successfully!

Note: Be sure to turn on the firewall after the operation is successful! ! !