Below is the latest log.
For clarity on my part, when you mention web host is it like this:
[Client] <–> [My Router] <–> [Nginx] <–> [Web Server/Host/TrueNas] <–> [Docker/NextCloud] ?
bvdrax@nginix:/etc/nginx/sites-available$ sudo tail -50 /var/log/nginx/reverse-error.log
2021/12/14 21:24:24 [error] 1182#1182: *231 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:24:56 [error] 1182#1182: *233 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:25:03 [error] 1182#1182: *235 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:25:28 [error] 1182#1182: *237 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:25:39 [error] 1182#1182: *239 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET / HTTP/1.1", upstream: "http://10.0.0.5:9001/", host: "cloud.supervarelas.com"
2021/12/14 21:26:00 [error] 1182#1182: *241 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:26:05 [error] 1182#1182: *243 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:26:32 [error] 1182#1182: *245 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:27:04 [error] 1182#1182: *247 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:27:07 [error] 1182#1182: *249 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:27:36 [error] 1182#1182: *251 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:28:08 [error] 1182#1182: *253 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:28:09 [error] 1182#1182: *255 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:28:40 [error] 1182#1182: *257 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:29:11 [error] 1182#1182: *259 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:29:12 [error] 1182#1182: *261 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:29:44 [error] 1182#1182: *263 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:30:13 [error] 1182#1182: *265 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:30:16 [error] 1182#1182: *267 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:30:48 [error] 1182#1182: *269 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:31:15 [error] 1182#1182: *271 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:31:20 [error] 1182#1182: *273 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:31:52 [error] 1182#1182: *275 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:32:17 [error] 1182#1182: *277 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:32:24 [error] 1182#1182: *279 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:32:56 [error] 1182#1182: *281 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:33:19 [error] 1182#1182: *283 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:33:28 [error] 1182#1182: *285 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:34:00 [error] 1182#1182: *287 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:34:21 [error] 1182#1182: *289 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:34:32 [error] 1182#1182: *291 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:35:04 [error] 1182#1182: *293 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:35:23 [error] 1182#1182: *295 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:35:36 [error] 1182#1182: *297 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:36:08 [error] 1182#1182: *299 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:36:25 [error] 1182#1182: *301 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:36:40 [error] 1182#1182: *303 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:37:12 [error] 1182#1182: *305 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:37:27 [error] 1182#1182: *307 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:37:44 [error] 1182#1182: *309 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:38:15 [error] 1182#1182: *311 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET / HTTP/1.1", upstream: "http://10.0.0.5:9001/", host: "cloud.supervarelas.com"
2021/12/14 21:38:16 [error] 1182#1182: *311 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://10.0.0.5:9001/favicon.ico", host: "cloud.supervarelas.com", referrer: "https://cloud.supervarelas.com/"
2021/12/14 21:38:16 [error] 1182#1182: *314 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:38:18 [error] 1182#1182: *311 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /index.php/apps/photos/service-worker.js HTTP/1.1", upstream: "http://10.0.0.5:9001/index.php/apps/photos/service-worker.js", host: "cloud.supervarelas.com", referrer: "https://cloud.supervarelas.com/index.php/apps/photos/service-worker.js"
2021/12/14 21:38:29 [error] 1182#1182: *317 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:38:47 [error] 1182#1182: *311 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /index.php/apps/photos/service-worker.js HTTP/1.1", upstream: "http://10.0.0.5:9001/index.php/apps/photos/service-worker.js", host: "cloud.supervarelas.com", referrer: "https://cloud.supervarelas.com/index.php/apps/photos/service-worker.js"
2021/12/14 21:38:48 [error] 1182#1182: *320 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:39:20 [error] 1182#1182: *322 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:39:31 [error] 1182#1182: *324 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.0.0.1, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"
2021/12/14 21:39:52 [error] 1182#1182: *326 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 23.121.225.73, server: cloud.supervarelas.com, request: "GET /status.php HTTP/1.1", upstream: "http://10.0.0.5:9001/status.php", host: "cloud.supervarelas.com"