Looks like rebooting the server (again) may have fixed it.
However, restarting the server built a new container from the image, so the nginx issue is back.
Can anyone tell me why this code exists in the nginx config files for a Discourse container:
in outlets/server/20-https.conf:
if ($http_host != huskerlist.tssi.com) {
rewrite (.*) https://huskerlist.tssi.com$1 permanent;
IMHO, either this code shouldn’t be there or it should also check $http_host against the secondsite FQDN, etc.