apache或nginx禁止通过ip访问

apache

<VirtualHost *:443>
    ServerName 服务器IP
    <Location />
        Order Allow,Deny
        Deny from all
    </Location>
</VirtualHost>

<VirtualHost *:80>
    ServerName 服务器IP
    <Location />
        Order Allow,Deny
        Deny from all
    </Location>
</VirtualHost>

nginx

	......
	listen 443 ssl http2;
    server_name www.a.com;
    index index.php index.html index.htm default.php default.htm default.html;
    root /www/html;
    
    if ($host != 'www.a.com'){
       return 403;
    }
  
#www.a.com是域名  
    ......

也可以新增一个server：
server{
        server_name xxx.xxx.xxx.xxx;
        return 403; ##或者直接返回403 或者 rewrite ^(.*) http://wwwbaidu.com permanent; ##强制跳转到指定的网址
}