求助， nginx 多站点配置，无法通过域名访问，使用 ip 访问会跳转到其中一个站点

在一台服务器设置了 Nginx 多站点，但是访问这些站点的域名均无法访问，错误如下图：

通过 ip 会跳转到其中一个站点，具体表现为：

全部配置开启的情况下所有域名无法访问， ip 访问显示的是siteD 去除 siteD 后跳转 siteB,去除 siteB 后 404 ，去除 siteB 后跳转 siteA ，去除 siteA 后跳转 siteC

检查了半天还是不知道是啥问题，请各位大神帮忙排查下 /w\

以下为具体配置文件：

nginx.conf

user nginx; worker_processes 1; error_log /var/log/nginx/error.log warn; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; sendfile on; #tcp_nopush on; server_tokens off; underscores_in_headers off; keepalive_timeout 65; #gzip on; include /etc/nginx/conf.d/*.conf; } 

default.conf

server { listen 80; server_name _; location / { return 404; } } 

siteA.conf

server { listen 80; server_name siteA.domain.com; access_log /var/log/nginx/siteA.access.log main; location / { root /usr/share/nginx/html/siteA; index index.php index.html index.htm; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } location ~ \.php$ { #try_files $uri =404; #root /usr/share/nginx/html/siteA; fastcgi_split_path_info ^(.+.php)(/.+)$; fastcgi_pass unix:/dev/shm/php5.6-fpm.sock; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_index index.php; include fastcgi_params; } } 

siteB.conf

server { listen 80; server_name siteB.domain.com; access_log /var/log/nginx/siteB.access.log main; location / { root /usr/share/nginx/html/siteB; index index.php index.html index.htm; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } location ~ \.php$ { try_files $uri =404; root /usr/share/nginx/html/siteB; fastcgi_split_path_info ^(.+.php)(/.+)$; fastcgi_pass unix:/dev/shm/php5.6-fpm.sock; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_index index.php; include fastcgi_params; } } 

siteC.conf

server { listen 80; server_name siteC.domain.com; access_log /var/log/nginx/siteC.access.log main; location / { root /usr/share/nginx/html/siteC/; index index.php index.html index.htm; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } location ~ \.php$ { try_files $uri =404; root /usr/share/nginx/html/siteC/; fastcgi_split_path_info ^(.+.php)(/.+)$; fastcgi_pass unix:/dev/shm/php5.6-fpm.sock; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; fastcgi_index index.php; include fastcgi_params; } } 

siteD.conf

server { listen 80; server_name siteD.domain.com; access_log /var/log/nginx/siteD.access.log main; location ~ ^/(baidu|webscan|yx_scan) { root /usr/share/nginx/siteD; } location / { proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header User-Agent $http_user_agent; proxy_set_header Accept-Encoding ""; proxy_redirect off; proxy_pass http://127.0.0.1:8080/siteD/; rewrite ^/WebGoat/(.*)$ /$1 last; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } } 

Nginx Info (使用 apt 安装， mainline)

nginx version: nginx/1.11.9 built by gcc 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) built with OpenSSL 1.0.1f 6 Jan 2014 TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie'