According to the nginx documentation [1] those values cannot usually exceed 75 seconds. The defaults are 60s and should probably be lowered to something reasonable like 20 or 30 seconds. [1] https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_connect_timeout
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.