nginx配置虚拟主机，访问了m.test.com变成了www.test.com

server {
    listen 80; # IPv4
    server_name m.test.com;

    ## Parametrization using hostname of access and log filenames.
    access_log logs/localhost_access.log;
    error_log logs/localhost_error.log;

    ## Root and index files.
    root html/test;
    index  index.php index.html index.htm;

    ## If no favicon exists return a 204 (no content error).
    location = /favicon.ico {
        try_files $uri =204;
        log_not_found off;
        access_log off;
    }
        
    ## Don't log robots.txt requests.
    location = /robots.txt {
        allow all;
        log_not_found off;
        access_log off;
    }
    ## Try the requested URI as files before handling it to PHP.
    location / {

        ## Regular PHP processing.
        location ~ \.php$ {
            try_files  $uri =404;
            fastcgi_pass   php_processes;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }

        ## Static files
        location ~* \.(?:css|gif|htc|ico|js|jpe?g|png|swf)$ {
            expires max;
            log_not_found off;
            ## No need to bleed constant updates. Send the all shebang in one
            ## fell swoop.
            tcp_nodelay off;
            ## Set the OS file cache.
            open_file_cache max=1000 inactive=120s;
            open_file_cache_valid 45s;
            open_file_cache_min_uses 2;
            open_file_cache_errors off;
        }

        ## Keep a tab on the 'big' static files.
        location ~* ^.+\.(?:ogg|pdf|pptx?)$ {
            expires 30d;
            ## No need to bleed constant updates. Send the all shebang in one
            ## fell swoop.
            tcp_nodelay off;
        }
        } # / location

} 

访问了m.test.com之后
出错了。。。没起效

hosts文件也修改了
ping也通了

回复内容：

server {
    listen 80; # IPv4
    server_name m.test.com;

    ## Parametrization using hostname of access and log filenames.
    access_log logs/localhost_access.log;
    error_log logs/localhost_error.log;

    ## Root and index files.
    root html/test;
    index  index.php index.html index.htm;

    ## If no favicon exists return a 204 (no content error).
    location = /favicon.ico {
        try_files $uri =204;
        log_not_found off;
        access_log off;
    }
        
    ## Don't log robots.txt requests.
    location = /robots.txt {
        allow all;
        log_not_found off;
        access_log off;
    }
    ## Try the requested URI as files before handling it to PHP.
    location / {

        ## Regular PHP processing.
        location ~ \.php$ {
            try_files  $uri =404;
            fastcgi_pass   php_processes;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
            include        fastcgi_params;
        }

        ## Static files
        location ~* \.(?:css|gif|htc|ico|js|jpe?g|png|swf)$ {
            expires max;
            log_not_found off;
            ## No need to bleed constant updates. Send the all shebang in one
            ## fell swoop.
            tcp_nodelay off;
            ## Set the OS file cache.
            open_file_cache max=1000 inactive=120s;
            open_file_cache_valid 45s;
            open_file_cache_min_uses 2;
            open_file_cache_errors off;
        }

        ## Keep a tab on the 'big' static files.
        location ~* ^.+\.(?:ogg|pdf|pptx?)$ {
            expires 30d;
            ## No need to bleed constant updates. Send the all shebang in one
            ## fell swoop.
            tcp_nodelay off;
        }
        } # / location

} 

访问了m.test.com之后
出错了。。。没起效

hosts文件也修改了
ping也通了

浏览器为了加快访问速度，一般都有dns缓存，你先尝试完全退出chrome浏览器，然后再试

如果不行，访问chrome://net-internals/#dns，点击如下按钮

你是不是*了吧。
要是*了。就把vpn退了再试试。