lnmp 一键安装后，修改了网站根目录，然后用默认的ip/phpmyadmin,报错404

nginx 配置如下：
nginx.conf

user  www www;

worker_processes auto;
worker_cpu_affinity auto;

#error_log  /home/wwwlogs/nginx_error.log  crit;
 error_log    /home/wwwlogs/nginx_error.log  info;
pid        /usr/local/nginx/logs/nginx.pid;

#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 51200;

events
    {
        use epoll;
        worker_connections 51200;
        multi_accept off;
        accept_mutex off;
    }

http
    {
        include       mime.types;
        default_type  application/octet-stream;

        server_names_hash_bucket_size 128;
        client_header_buffer_size 32k;
        large_client_header_buffers 4 32k;
        client_max_body_size 50m;

        sendfile on;
        sendfile_max_chunk 512k;
        tcp_nopush on;

        keepalive_timeout 60;

        tcp_nodelay on;

        fastcgi_connect_timeout 300;
        fastcgi_send_timeout 300;
        fastcgi_read_timeout 300;
        fastcgi_buffer_size 64k;
        fastcgi_buffers 4 64k;
        fastcgi_busy_buffers_size 128k;
        fastcgi_temp_file_write_size 256k;

        gzip on;
        gzip_min_length  1k;
        gzip_buffers     4 16k;
        gzip_http_version 1.1;
        gzip_comp_level 2;
        gzip_types     text/plain application/javascript application/x-javascript            text/javascript text/css application/xml application/xml+rss;
        gzip_vary on;
        gzip_proxied   expired no-cache no-store private auth;
        gzip_disable   "MSIE [1-6]\.";

        #limit_conn_zone $binary_remote_addr zone=perip:10m;
        ##If enable limit_conn_zone,add "limit_conn perip 10;" to server section.

        server_tokens off;
        access_log off;

server
    {
        listen 80 default_server reuseport;
        #listen [::]:80 default_server ipv6only=on;
        server_name _;
        index index.html index.htm index.php;
      #  root  /home/wwwroot/default;
       root   /mnt/iscsi;

        #error_page   404   /404.html;

        # Deny access to PHP files in specific directory
        #location ~ /(wp-content|uploads|wp-includes|images)/.*\.php$ { deny all; }

        #include enable-php.conf;
include enable-php-pathinfo.conf;

        location /nginx_status
        {
            stub_status on;
            access_log   off;
        }

        location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
        {
            expires      30d;
        }

        location ~ .*\.(js|css)?$
        {
            expires      12h;
        }

        location ~ /.well-known {
            allow all;
        }

        location ~ /\.
        {
            deny all;
        }



        access_log  /home/wwwlogs/access.log;

    }
include vhost/*.conf;
}

修改了root，为 /mnt/iscsi，可以访问php文件，但是phpadmin在默认目录/home/wwwroot/default,下，我设置了一个软连接，报错No input file specified.

请教怎么正确设置？

另附nginx的日志：

Unable to open primary script: /mnt/iscsi/phpmyadmin/index.php (Operation not permitted)” while reading response header from upstream, client: x.x.x.x, server: _, request: “GET /phpmyadmin/ HTTP/1.1”, upstream: “fastcgi://unix:/tmp/php-cgi.sock:”, host: “我的ip”