Silverstripe on nginx

Hi.

I had installed Silverstripe on nginx with SilverStripe 3.1.2 on Debian 7.
When I install Silverstripe in the default root directory, all works very well.
But when I want to install it to an subdir like /cms, I can do the setup and the site will show up successfully. But when I open the site new, I get an Error 404.

I used this nginx Directives in ISPconfig:

Code:

location ^~ /assets/ {
                try_files $uri =404;
                expires max;
                access_log off;
                log_not_found off;
       }
       location ~ \.ss {
                allow 127.0.0.1;
                deny all;
       }
       location ~ web\.config {
                deny all;
       }
       location ~ \.(ya?ml|bak|swp)$ {
                deny all;
       }
       location ~ ~$ {
                deny all;
       }
       location ^~ /silverstripe-cache/ {
                deny all;
       }
       location ^~ /vendor/ {
                deny all;
       }
       location ~ /composer\.(json|lock) {
                deny all;
       }
       location ~ ^/framework/(.+/)?(main|rpc|tiny_mce_gzip)\.php$ {
                try_files /6c1ec1bb21001dd913db95cfb05d78d7.htm @php;
       }
       location ~ ^/(cms|framework|mysite)/.+\.(php|php[345]|phtml|inc)$ {
                deny all;
       }
       location ~ ^/(cms|framework)/silverstripe_version$ {
                deny all;
       }

       error_page 404 /assets/error-404.html;
       error_page 500 /assets/error-500.html;

       location / {
                 if (!-f $request_filename) {
                    rewrite ^/(.*?)(\?|$)(.*)$ /framework/main.php?url=$1&$3 last;
                 }
       }

       location ~ ^/(index|install)\.php/ {
                fastcgi_split_path_info ^((?U).+\.php)(/?.+)$;
                include /etc/nginx/fastcgi_params;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
       }

       location ~ \.php$ {
                try_files /6c1ec1bb21001dd913db95cfb05d78d7.htm @php;
       }

       location @php {
                try_files $uri =404;
                include /etc/nginx/fastcgi_params;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                fastcgi_intercept_errors on;
                fastcgi_temp_file_write_size 10m;
                fastcgi_busy_buffers_size    512k;
                fastcgi_buffer_size          512k;
                fastcgi_buffers           16 512k;
                fastcgi_read_timeout 1200;
       }

from timmehosting.de.
This works fine as long as I install it to the root dir for example
/var/www/clients/clientx/webx/web/

How to change this for the Subdir like /cms/ ?
For example:
/var/www/clients/clientx/webx/web/cms/

I changed the Directives to fit for me (like I thought), but it won't work.

I hope anyone can help me.

With kind regards,
badenzer