SSL routines:ssl3_get_record:wrong version number

Hi, I followed the following tutorial:

https://www.digitalocean.com/community/tutorials/how-to-install-an-ssl-certificate-from-a-commercial-certificate-authority#step-2-generating-a-csr-and-private-key

to install a cert, that I bought via Namecheap using Apache.

This has been useful, but I keep getting the error I mentioned above, when I do:

curl --verbose --insecure https://[mydomain].de

I can always replicate the problem, when I log onto https://[mydomain].de I am getting an error in the Chrome browser:

ERR_SSL_PROTOCOL_ERROR

I should say that I’m new to installing certs, so it may well be a simple error.

Many thanks

Felix