settings.py에는 이렇게 작성했고

ALLOWED_HOSTS = ['52.78.172.36']

Last login: Thu Jun 23 00:57:02 2022 from 54.239.116.96
ubuntu@ip-172-26-14-90:~$ date
Thu Jun 23 01:49:01 KST 2022
ubuntu@ip-172-26-14-90:~$ cd ~/venvs/mysite/bin
(mysite) ubuntu@ip-172-26-14-90:~/venvs/mysite/bin$ . activate
(mysite) ubuntu@ip-172-26-14-90:~/venvs/mysite/bin$ cd ~/projects/mysite
(mysite) ubuntu@ip-172-26-14-90:~/projects/mysite$ killall python
python: no process found
(mysite) ubuntu@ip-172-26-14-90:~/projects/mysite$ python manage.py runserver 0:8000
Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
June 23, 2022 - 01:51:38
Django version 3.1.3, using settings 'config.settings'
Starting development server at http://0:8000/
Quit the server with CONTROL-C.

터미널에는 이렇게 작성 했습니다.
지금 다시 확인해보니 이젠 연결을 거부하는데 코드 오류가 있는건가요?

혹시 모르니 오류코드도 같이 올립니다.

DisallowedHost at /
Invalid HTTP_HOST header: '52.78.172.36:8000'. You may need to add '52.78.172.36' to ALLOWED_HOSTS.
Request Method: GET
Request URL: http://52.78.172.36:8000/
Django Version: 3.1.3
Exception Type: DisallowedHost
Exception Value:
Invalid HTTP_HOST header: '52.78.172.36:8000'. You may need to add '52.78.172.36' to ALLOWED_HOSTS.
Exception Location: /home/ubuntu/venvs/mysite/lib/python3.8/site-packages/django/http/request.py, line 137, in get_host
Python Executable: /home/ubuntu/venvs/mysite/bin/python
Python Version: 3.8.10
Python Path:
['/home/ubuntu/projects/mysite',
'/usr/lib/python38.zip',
'/usr/lib/python3.8',
'/usr/lib/python3.8/lib-dynload',
'/home/ubuntu/venvs/mysite/lib/python3.8/site-packages']
Server time: Thu, 23 Jun 2022 01:56:58 +0900

답변해주셔서 감사합니다!