Nginx - Redis 服务器问题

Question

我有一个 Ubuntu 14.04 VPS，其中有多个 WP 网站在 Nginx 中运行（使用本教程：https://deliciousbrains.com/hosting-wordpress-setup-secure-virtual-server/）

启用 Redis 服务器后，所有网站都会重定向到 Nginx 中第一个启用的网站。关闭 Redis 服务器即可解决该问题。

我已经使用以下链接安装了 Redis-Server：https://deliciousbrains.com/hosting-wordpress-yourself-server-monitoring-caching/

有什么建议可以解决这个问题吗？根据教程，不需要额外的配置。

干杯，Jaap

nginx.conf

user www-data;  
worker_processes 2;
pid /run/nginx.pid;

events {
worker_connections 2048;
multi_accept on;
}

http {

##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 15;
types_hash_max_size 2048;
server_tokens off;
client_max_body_size 64m;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

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

##
# 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 2;
# 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;

##
# Cache Settings
##

add_header Fastcgi-Cache $upstream_cache_status;

##
# SSL
##

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
ssl_prefer_server_ciphers on;
ssl_dhparam /etc/ssl/dhparams.pem;

#add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";

ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;

##
# Virtual Host Configs
##

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

fastcgi_cache_key "$scheme$request_method$host$request_uri";

server {
listen 80 default_server;
server_name _;
return 444;
}
}