I am not sure if this is the right forum for this question, but since it is Django related, I will go ahead and ask here.

I have created a simple Django app which has been deployed in Pythonanywhere using a free server. I have a multi-db setup where the default database uses MySQL which is available in Pythonanywhere and I also have a second database which uses Postgres and is deployed in Heroku which is also a paid add on. This is the first time I am trying a multi-db setup. I am using the latest version of Django (V3.0.5).

The problem is, everything works fine when I try to connect to Postgres when using the development server from my system. But when I try to connect to it after the app is deployed live, I get a server error. The server log from Pythonanywhere shows the below message. Can anyone guide me on what this error means and how can I go about fixing it?

Note - I have masked the Host and IP Address in the below error as the credentials belong to our production db.

 django.db.utils.OperationalError: could not connect to server: Connection refused #011Is the server running on host "<HOST>" (<IP ADDRESS>) and accepting #011TCP/IP connections on port 5432?

Below is how my settings.py file looks like for reference. Note that I have masked the production db credentials.

if DEBUG:
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.sqlite3',
            'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
        },
        'postgres': {
            'ENGINE': 'django.db.backends.postgresql',
            'NAME': 'NAME',
            'USER': 'USER',
            'PASSWORD': 'PASSWORD',
            'HOST': 'HOST',
            'PORT': '5432',
        },
    }
else:
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.mysql',
            'NAME': 'NAME',
            'USER': 'USER',
            'PASSWORD': 'PASSWORD',
            'HOST': 'HOST',
            'PORT': '3306',
            'OPTIONS': {
                'init_command': "SET sql_mode='STRICT_TRANS_TABLES'",
            }
        },
        'postgres': {
            'ENGINE': 'django.db.backends.postgresql',
            'NAME': 'NAME',
            'USER': 'USER',
            'PASSWORD': 'PASSWORD',
            'HOST': 'HOST',
            'PORT': '5432',
        },
    }

​