So I have a similar problem. I get the SESSION ERROR issue but it's only under the following situations when I'm trying to set up a reverse proxy:
- I use my domain name for the Server Network Settings - Hostname/IP Address
- I use a custom network rather than bridge
Under these situations, I can get to the admin page from my domain or from my home network url:943. However, if I try to login to the admin page, it fails with the SESSION ERROR and the vpn service does not work. If I revert to using my home IP and BRIGE, everything pretty much works (though of course I'm not using the reverse proxy.
The three console commands posted above did not work for me.
[as an aside, using the INTERFACE variable seems to do jack and shit]
[as a further aside the fucking invalid certificate errors that seem to keep me from using chrome to access the site are annoying AF]