Error since added SSL certificate

Merry Christmas everyone!

I eel recently added an SSL certificate to my domain where the application is hosted with Django.

Since I setup the SSL certificate I've been receiving a lot of errors like this:

SuspiciousOperation: Invalid HTTP_HOST header (you may need to set ALLOWED_HOSTS): AAA.BBB.CCC.DDD

Where AAA.BBB.CCC.DDD is the IP address of my server - ie- I'm getting a lot of requests direct to the IP of the server.

Can anyone suggest why these requests have been coming in? I can't see anything in the request suggesting where these requests are coming from.

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