If your seeing a lock next to the name ...... it sounds like you are not authorized by the security policies from the on-site policy distribution. According to what Cisco says when you connect with the VPN client, the box in the location you are trying to connect to "should" allow you access to the files on the server, as long as you have rights to them while you are on-site. If not, I would think that the security policy configuration on the cisco box onsite will have to be edited to allow you to do what you are looking to do offsite. There really should not be much configuration on your end unless you are just installing it for the first time and would have to input the VPN box info. since you do connect to the server, but just don't see anything on it, I would definitely say it would be an onsite thing......but I could be wrong.
Here is the link to the cisco stuff I was looking at if you havn't already been there...
http://www.cisco.com/en/US/products/sw/secursw/ps2308/