ERR_SSL_VERSION_OR_CIPHER_MISMATCH when using CNAME to redirect www to non-www on app platform

I have a simple static site on App Platform, to which I have added a custom domain (let’s call it The domain is hooked up to Digital Ocean’s name servers, and I can navigate to the app using

The problem is that is not resolved. So I’ve added a CNAME record to the DNS with:

hostname = www value = @

Now, resolves, but to a Chrome warning screen which says:

The connection for this site is not secure uses an unsupported protocol.


Can someone explain to me why this is, if I’ve done something wrong with the DNS record and suggest how to resolve this? Thanks

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