502 Bad Gateway в ngnix с конфигурацией ssl, прокси и php7.1

У меня есть сервер Debian 9 с некоторыми виртуальными хостами на моем nginx.
Я использую подстановочный знак letsencrypt и настроил некоторые инструменты, такие как webmin, monitorix и веб-интерфейс для бота для teampeak.

Я создал файл .conf для каждого субдомена.

На странице home.website.net нет проблем. Это просто HTML с картинками и текстом без php или чего-то еще.

Webmin тоже работает нормально, sinusbot и monitorix нет.

Вот мои конфиги:

root@host:~# cat /etc/nginx/nginx.conf
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
worker_connections 768;
# multi_accept on;
}

http {

##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;

##
# SSL Settings
##

ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

##
# Logging Settings
##

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

##
# Gzip Settings
##

gzip on;
gzip_disable "msie6";

# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

##
# Virtual Host Configs
##

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}

Далее это хост по умолчанию, который работает нормально:

root@host:~# cat /etc/nginx/sites-available/default

# Default server configuration
#
server {

root /var/www/html;

# Add index.php to the list if you are using PHP
index index.html index.htm index.php ;

server_name home.website.net 192.168.1.16 XXX.XXX.XXX.XXX;

location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ =404;
}

location ~ \.php$ {
# fastcgi_pass unix:/run/php/php7.1-fpm.sock;
fastcgi_pass 127.0.0.1:9000;
include snippets/fastcgi-php.conf;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}

location ~ /\.ht {
deny all;
}


listen 443 ssl http2; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/website.net/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/website.net/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

server  {
listen 80;
listen [::]:80;
server_name home.website.net 192.168.1.16 XXX.XXX.XXX.XXX;
# enforce https
return 301 https://$host$request_uri;
}

Вот первый поддомен, sinusbot, который не работает:

root@host:~# cat /etc/nginx/sites-available/sinusbot.conf
server {
listen 80;
listen [::]:80;
server_name sinusbot.website.net;
access_log  /var/log/nginx/sinusbot.access.log;
error_log   /var/log/nginx/sinusbot.error.log;
return 301 https://$host$request_uri;
}

server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
access_log  /var/log/nginx/sinusbot.access.log;
error_log   /var/log/nginx/sinusbot.error.log;
server_name sinusbot.website.net;
ssl on;
ssl_certificate /etc/letsencrypt/live/website.net/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/website.net/privkey.pem;
client_max_body_size 100M;

location ~ \.php$ {
# fastcgi_pass unix:/run/php/php7.1-fpm.sock;
fastcgi_pass 127.0.0.1:9000;
include snippets/fastcgi-php.conf;
fastcgi_param SCRIPT_FILENAME
$document_root$fastcgi_script_name;
}

location ~ /\.ht {
deny all;
}

location / {
proxy_pass      https://127.0.0.1:8087;
proxy_redirect  off;

#Proxy Settings
proxy_redirect     off;
proxy_set_header   Host $host:$server_port;
proxy_set_header   X-Real-IP        $remote_addr;
proxy_set_header   X-Forwarded-For
$proxy_add_x_forwarded_for;

proxy_max_temp_file_size 0;
proxy_connect_timeout      90;
proxy_send_timeout         90;
proxy_read_timeout         90;
proxy_buffer_size          128k;
proxy_buffers              32 32k;
proxy_busy_buffers_size    256k;
proxy_temp_file_write_size 256k;
}
}

Второй (monitorix) имеет ту же конфигурацию, но с другим портом и поддоменом. На обоих я получаю 502 Bad Gateway и в лог-файлах следующие ошибки:

access.log:

192.168.1.1 - - [10/Jun/2018:20:22:01 +0200] "GET / HTTP/2.0" 502 638 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36"192.168.1.1 - - [10/Jun/2018:20:22:01 +0200] "GET /favicon.ico HTTP/2.0" 502 638 "https://sinusbot.website.net/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36"

журнал ошибок:

2018/06/10 20:22:22 [error] 18522#18522: *51 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.1, server: sinusbot.website.net, request: "GET / HTTP/2.0", upstream: "https://127.0.0.1:8087/", host: "sinusbot.website.net"2018/06/10 20:22:22 [error] 18522#18522: *51 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.1.1, server: sinusbot.website.net, request: "GET /favicon.ico HTTP/2.0", upstream: "https://127.0.0.1:8087/favicon.ico", host: "sinusbot.website.net", referrer: "https://sinusbot.website.net/"

Наконец, конфиг Webmin ngnix, который работает без проблем:

root@host:~# cat /etc/nginx/sites-available/webmin.conf
server {
listen 80;
listen [::]:80;
server_name webmin.website.net;
access_log  /var/log/nginx/webmin.access.log;
error_log   /var/log/nginx/webmin.error.log;
return 301 https://$host$request_uri;
}

server {
server_name webmin.website.net;
listen 443 ssl http2;
ssl on;
ssl_certificate /etc/letsencrypt/live/website.net/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/website.net/privkey.pem;
access_log off;
error_log off;
location /RequestDenied {
return 418;
}

location / {
proxy_pass      https://127.0.0.1:10000;
proxy_redirect  off;

#Proxy Settings
proxy_redirect     off;
proxy_set_header   Host $host:$server_port;
proxy_set_header   X-Real-IP        $remote_addr;
proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

proxy_max_temp_file_size 0;
proxy_connect_timeout      90;
proxy_send_timeout         90;
proxy_read_timeout         90;
proxy_buffer_size          128k;
proxy_buffers              32 32k;
proxy_busy_buffers_size    256k;
proxy_temp_file_write_size 256k;
}
}

Есть идеи?