Thanks for responding.
Firstly, the aos.baseUrlOverwrite option is set correctly to https://<alfresco server dns>/alfresco/aos in the alfresco-global.properties file
With respect to your other questions...
1. The version of nginx we are running is "openresty/22.214.171.124" and it is compiled with the "--with-http_dav_module" flag and is verified by running nginx -V
2. Commercial certs for our domains are installed and configured within the nginx config on each of our domains "prod", "uat" and "dev"and all are trusted by all Windows machines on our network.
All http traffic is automatically redirected to https at the nginx reverse proxy and is then proxied on to the correct service endpoints i.e. http://alfresco:8080
3. All components of the Alfresco installation, alfresco, share, solr6, nginx etc are all running inside independent docker containers started with a docker-compose.yml file running on ubuntu 16.04 VM's. So the alfresco web client is not running on a windows box and alfresco itself has been deployed along with the aos amp file.
All SSO auth is done via Kerberos and users are automatically logged into their Share UI when selecting an "Internet Explorer shortcut" from their desktop once logged in.
4. I have tried setting up a mapped drive with both the https:// and a UNC options, like you stated. All options return the same Windows errors I stated in my original post.
For the UNC options I have tried
\\<alfresco server dns>@SSL\alfresco\aos - The DNS of the server running the Alfresco docker images ad defined in the SSL certs
\\<hostname>@SSL\alfresco\aos - The hostname of the Ubunto 16.04 VM running the Alfresco docker image
\\<IP>@SSL\alfresco\aos - The IP address of the Ubunto 16,04 VM running the Alfresco docker images