Adding SSL certificate to Site

[snowfly]

Can anyone help me with setting up an SSL certificate for a site on ISPconfig 3?

I have web site that was running perfectly fine on a separate custom debian system (not ISPconfig), with an SSL cert.

And we moved this site to a new ISPconfig3 server.

In the ISPconfig3 interface I pasted the SSL cert into the "SSL Certificate" field on the SSL tab of Web Domain.
And ticked the box for SSL.

However site does not work.
Firefox reports error:
SSL received a record that exceeded the maximum permissible length.
(Error code: ssl_error_rx_record_too_long)

I cannot find anything in ispconfig logs.

When I view the apache config file (e.g. /etc/apache2/sites-enabled/abc.domain.com) I cannot see any reference of SSL.

On our previous custom server, we had these entries:

SSLEngine On
SSLCertificateFile /etc/apache2/ssl/abc.domain.com.crt
SSLCertificateKeyFile /etc/apache2/ssl/abc.domain.com.key


The SSL tab in ISPconfig has 3 fields:
- SSL Request
- SSL Certificate
- SSL Bundle

Which one does the SSL key file go in?
Which one does the SSL CSR file go in?
And does the SSL cert (*.crt) go in the SSL Certificate box?

Thanks in advance.