Look at the sample config on:
http://www.cisco.com/warp/customer/471/sdi.html
and compare your configs. Make sure you define the VPN3015 as a client on the Secureid server. Also, check on Administration>File Management>Files
section you have the secureid file which is the node secret sent from the Secure ID server to the concentrator. If you don't have this, the communication between the concentrator and SecureID server is not happening most probably because Secureid doesn't know that the 3015 is a client.