not able to enable browser caching of static assets

[deep-blue]

Hi

I have two platform on my site drupal and vbulletin. vbulletin forum is hosted on mysite.com/forum

We are further using rack space cloud for cdn and host images and css / jss files on cdn.

So structure is like this

mysite.com/forum - main website forum
rscdn.com - rackspace cdn
mysitestatic.com - cookiless domain

now with using cname
cdn.mysitestatic.com points to rscdn.com

and i replace ursl at my mainsite.com/forum with cdn.mysitestatic.com
++++++++++++++++++++
.htaccess at mysite.com
---------

# Requires mod_expires to be enabled.
<IfModule mod_expires.c>
# Enable expirations.
ExpiresActive On

# Cache all files for 2 weeks after access (A).
ExpiresDefault A1209600

<FilesMatch \.php$>
# Do not allow PHP scripts to be cached unless they explicitly send cache
# headers themselves. Otherwise all scripts would have to overwrite the
# headers set by mod_expires if they want another caching behavior. This may
# fail if an error occurs early in the bootstrap process, and it may cause
# problems if a non-Drupal PHP file is installed in a subdirectory.
ExpiresActive Off
</FilesMatch>
</IfModule>

++++++++++++
.htaccess at mysitestatic.com
-----
# Speed up caching
FileETag MTime Size

ExpiresByType image/jpeg A1814400000
ExpiresByType image/gif A1814400000
ExpiresByType image/png A1814400000
ExpiresByType image/x-icon A1814400000
ExpiresByType text/plain A1814400000

# Good for one week
ExpiresByType application/x-javascript M604800
ExpiresByType text/css M604800
ExpiresByType text/html M604800


# Expires
ExpiresActive On
ExpiresDefault "access plus 366 days"

# Future Expires Headers
<filesmatch ".(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
Header set Expires "Sat, 27 Dec 2015 23:59:59 GMT"
</filesmatch>