尝试使用Nginx在我的CentOS 7 VPS上安装phpBB（3.2.7），并得到403、502错误或默认页面

我正在尝试使用Nginx在我的CentOS 7 VPS上安装phpBB（3.2.7），并且不断出现这些错误：

• 403-禁止
• Nginx默认页面显示Web服务器正在运行，但是尝试访问http://1.2.3.4/install时为404 （安装phpBB时需要）
• 502错误的网关（当前困境）

以下是我的/etc/nginx/nginx.cfg：

user    nginx nginx;

events {
    worker_connections  1024;
}

http {
    include     /etc/nginx/mime.types;

    # Compression - requires gzip and gzip static modules.
    gzip on;
    gzip_static on;
    gzip_vary on;
    gzip_http_version 1.1;
    gzip_min_length 700;

    # Compression levels over 6 do not give an appreciable improvement
    # in compression ratio, but take more resources.
    gzip_comp_level 6;

    # IE 6 and lower do not support gzip with Vary correctly.
    gzip_disable "msie6";
    # Before nginx 0.7.63:
    #gzip_disable "MSIE [1-6]\.";

    # Catch-all server for requests to invalid hosts.
    # Also catches vulnerability scanners probing IP addresses.
    server {
        # default specifies that this block is to be used when
        # no other block matches.
        listen 80 default;

        server_name bogus;
        return 444;
        root /var/empty;
    }

    # NOTE: uncommenting this section causes the program to print to console: 
    #'nginx: [warn] conflicting server name "1.2.3.4" on 0.0.0.0:80, ignored'
    # Typing in my VPS IP results in 414 - URI Too Large 
    # http://1.2.3.4/1.2.3.4/1.2.3.4/1.2.3.4 ...

    # If you have domains with and without www prefix,
    # redirect one to the other.
    #server {
    #    # Default port is 80.
    #    listen 80;
    #    server_name 1.2.3.4;
         # A trick from http://wiki.nginx.org/Pitfalls#Taxing_Rewrites:
    #    return 301 1.2.3.4$request_uri;
    #}

    # The actual board domain.
    server {
        listen [::]:80;
        listen 80;
        server_name 1.2.3.4;
        root /var/www/html/mydomain.com/phpBB-3.2.7;

        location / {
            # phpBB uses index.htm
            index index.php index.html index.htm;
            try_files $uri $uri/ @rewriteapp;
        }

        location @rewriteapp {
            rewrite ^(.*)$ /app.php/$1 last;
        }

        # Deny access to internal phpbb files.
        location ~ /(config\.php|common\.php|cache|files|images/avatars/upload|includes|(?<!ext/)phpbb|store|vendor) {
            deny all;
            # deny was ignored before 0.8.40 for connections over IPv6.
            # Use internal directive to prohibit access on older versions.
            internal;
        }

        # Pass the php scripts to fastcgi server specified in upstream declaration.
        location ~ \.php(/|$) {
            # Unmodified fastcgi_params from nginx distribution.
            include fastcgi_params;
            # Necessary for php.
            fastcgi_split_path_info ^(.+\.php)(/.*)$;
            fastcgi_param PATH_INFO $fastcgi_path_info;
            fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
            fastcgi_param DOCUMENT_ROOT $realpath_root;
            try_files $uri $uri/ /app.php$is_args$args;
            fastcgi_pass php;
        }

        # Correctly pass scripts for installer
        location /install/ {
            # phpBB uses index.htm
            try_files $uri $uri/ @rewrite_installapp;

            # Pass the php scripts to fastcgi server specified in upstream declaration.
            location ~ \.php(/|$) {
                # Unmodified fastcgi_params from nginx distribution.
                include fastcgi_params;
                # Necessary for php.
                fastcgi_split_path_info ^(.+\.php)(/.*)$;
                fastcgi_param PATH_INFO $fastcgi_path_info;
                fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
                fastcgi_param DOCUMENT_ROOT $realpath_root;
                try_files $uri $uri/ /install/app.php$is_args$args;
                fastcgi_pass php;
            }
        }

        location @rewrite_installapp {
            rewrite ^(.*)$ /install/app.php/$1 last;
        }

        # Deny access to version control system directories.
        location ~ /\.svn|/\.git {
            deny all;
            internal;
        }
    }

    # If running php as fastcgi, specify php upstream.
    upstream php {
        server 127.0.0.1:9000;
    }
}

其他资讯：

• 更改了以下行/etc/php.ini：

  max_execution_time = 180
  max_input_time = 60
  memory_limit = 256M
  upload_max_filesize = 64M
  

• 我使用的是静态IP，因为我正在等待从以前的托管公司转移我的域。我假设我可以将VPS的静态IP（例如1.2.3.4）放置在实际域中，并在转移后用域替换它？