Nginx setup debugging strategy please

Configuration
1

Could someone please give me a deubugging strategy for getting Nginx proxy manager working properly? My situation is this:
I had everything working fine with DuckDNS aand could access my instance from home and away. Then I decided I had better finally enable LetsEncrypt to use SSL which worked fine, except of course I could not access my HA instance locally without using a browser than would let me overcome the lack of a matching SSL certificate. So I then tried to setup the official Add On NGINX Home Assistant SSL proxy and changed configuration.yaml to have this in http:

http:
#  base_url: https://MY-DOMAIN.duckdns.org
#  ssl_certificate: /ssl/fullchain.pem
#  ssl_key: /ssl/privkey.pem
  use_x_forwarded_for: true     # To ensure HA understands that client requests come via reverse proxy
  trusted_proxies:
    - 192.168.86.0/24            # In Home Assistant we need to add the Docker subnet
    - 127.0.0.1                 # Add the localhost IPv4 address
    - ::1                       # Add the localhost IPv6 address

Now I can only get at the HA instance internally on port 8123:
http://192.168.86.30:8123

I have port forwarded 80,81, and 443 to my HA machine above.

When that didn’t work I uninstalled the official Nginx add-on and tried the community add-on Nginx Proxy Manager, but the visible behaviour was the same, when connecting to https://MY-DOMAIN.duckdns.org the browser compained about note being able to make a secure connection. The logs in the Nginx Proxy Manager show my local http connections but no connection attempts from outside. The only error I can find is in the Core logfile which says this:

File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 314, in data_received
    messages, upgraded, tail = self._request_parser.feed_data(data)
  File "aiohttp/_http_parser.pyx", line 546, in aiohttp._http_parser.HttpParser.feed_data
aiohttp.http_exceptions.BadStatusLine: 400, message="Bad status line 'invalid HTTP method'"

Can anyone give me a debugging strategy?

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