NSA310S - Access from Internet

My NAS sits inside my home network.

Over the internet, I want to access via https://abc.xyz.com ( the nas host is NSA310S) and use port forwarding to pass internally to the NAS (tried both LAN:80 and LAN:443)

When accessing via HTTP it works fine BUT when via HTTPS I get the unsafe message. I have a certificate for for my domain installed on the client but because the server name does not match the URL it doesn't like it.

Any ideas?

Thanks in advance

#NAS_November