Bad response RPC

[octera]

Bonjour,
J'ai l'erreur suivante dans rutorrent :
[25.04.2019 23:59:50] Bad response from server: (404 [error,list]) <title>404 Not Found</title>

404 Not Found

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nginx

avec une erreur 404 (en vrai 500) sur https://xxxx/torrent/rpc

Voila les logs nginx :
2019/04/25 22:01:51 [error] 3025#3025: *375 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.1.1.1, server: _, request: "POST /torrent/RPC HTTP/1.0", upstream: "scgi://127.0.0.1:5000", host: "xxxx, referrer: "https://xxxx/torrent/"
2019/04/25 22:01:51 [error] 3025#3025: *375 open() "/usr/share/nginx/html/50x.html" failed (2: No such file or directory), client: 10.1.1.1, server: _, request: "POST /torrent/RPC HTTP/1.0", upstream: "scgi://127.0.0.1:5000", host: "xxxx", referrer: "https://xxxx/torrent/"

Une idée?