barkyourtail on "SSL and Admin"

Hello, first time posting. Trying to run admin in SSL. I have forced it using config, changed URL to https:// , changed it on server , NGINX to default to SSL for complete site.
When it loads, I only get text links. No CSS or anything else. I can sign into admin on another server/site using same computer and network ..all fine.
I'm stumped, my host is stumped...What could possibly cause this. I get an ERR_connection_not authorized, err_net_connection..using lte / mobile network on a mac. No static IP.
Any advice would help. My ISP wants to charge me 140$ to tell me how to fix it. No antivirus, all https connections work fine. It's just the admin on this install. It seem like my CSS files are being rejected as wells as other files when trying to execute in https in admin only The site works fine in https...just admin issue. Thx