Pihole behind Nginx sudden routing issue (opens in new tab)

I’ve been racking my brain the whole afternoon trying to figure out why when I try to access my Pihole over Web GUI suddenly I’m met with SEC_ERROR_UNKNOWN_ISSUER error. My setup: - Nginx (SWAG) runs on my server and routes all apps on the server, plus two separate devices (Unifi and Pihole) - Pihole runs on a Raspi with a fixed IP - Nginx conf points to Pihole’s IP on port 80 over http protocol. This worked perfectly fine until several days ago (well, that’s when I noticed the issue). Now wh...