File api - directory exists but returns false.

Flash Media Server 4.
in main.asc - onconnect.
var my_dir = new File("/xxx/yyy/atest");
trace(my_dir.exists); // false
if ( my_dir.isDirectory ) // false
Do I need to configure something to use API.
I know the directory exists and as shown below.
under the directory /xxx/yyy/
drwxrwsr-x 2 flash content 512 May 3 2011 atest
Thanks

I tried using symlink from the application and tried still it failed. I also
tested creating local directory it failed.
/opt/app/adobe/fms/applications/myapp - location of app
/content - nas location
under myapp directory created a symlink to /content
ln -s /content .
under myapp directory it created a content directory.
I tried to access content/my_test - directory and it gives false.
Do I need to enable something here to to know if the file or directory
exists.
I also tested by created a local directory and tested it also fails.
#Version: 1.0
#Start-Date: 2011-05-05 11:27:17
#Software: Adobe Flash Media Server 4.0.0 r1121 x86
Thanks for all the help.

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