For some unknown reason, some users land on the NGINX welcome page instead of the main site…
The only way I could reproduce this behavior was by trying to access the site through its ip address.
I forwarded the ip address to the main site in the config and now I don’t land on the NGINX page anymore… but for those users, it still does not work.
One of them is on a mac, and others are on Windows PC
Someone has a clue? At first I thought it was poor dns redirection from their ISP, but now I don’t know…
Okay, the mystery has cleared itself… It so happened to be that our sales representative was sending links to our domain name with “www” in front (https://www.[domain-name.com]/[chatroom]… Our nginx server was not setup to respond to that combination.
Since he has already connected to our site using the correct way (https://[domain-name]/[chatroom]), he was not, himself, affected by the issue as his browser would “translate” the address afterwards. Upon clearing his history and cache, the issue affected him too.
I entered a forward in the nginx config file to translate “www” access to the correct address and everything works fine now…
So, it was all a code 18 (18 inches from the computer monitor!)