failed to access directory thru ftp

Hi all,

 I am a beginner to unix and ftp too.So i request your valuable comments.

Requirement:
I want to put a specific file into a server(linux) and under a particular directory path in that server as /caps/details/data/

Problem :
I login to that server through the command `ftp hostname` and i tried to change the directory path as cd /caps/details/data
but it was showing
550 Failed to change directory.

But i am sure that the directory path is there and i can rwx scripts too in that directory,problem is only thru ftp.Would anyone pls give my some idea
as fast as you can ?

Your help is appreciated.

you probably don't have access to the directory under the username you used to log into the server it is on.