VPN kerberos? NAS issue

Hi,
I have a Windows 2003 native Active Directory. I have a 3rd Party VPN
solution that uses SecurID tokens to authenticate users before allowing them
access (completely separate to AD, and not integrated).

Users log on to their laptops at home (using cached credentials, as no DC's
available), then establish a VPN connection to the LAN. They are able to
access all resources (Exchange email, File servers etc), with the exception
of unix powered NAS boxes. When attempting to map a drive to these NAS
boxes, users receive an access denied message. When on the LAN, users can
access the NAS boxes without this error.

Presumably there is some authentication issue related to the users working
from cached cred accessing unix resources.(but this is OK - or somehow gets
revalidated for access to Windows based resources).

Any ideas how to resolve the access denied?
.

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