Hi Scott,
Did you make sure the VPN is applied on the outside interface? Are the WAN interface available for the IPSec Connection.
You can find this error message here, and some other errors:
http://www.linksysinfo.org/index.php?resources/other-subject-log-explanation.24/
No interface for this connection, VPN IPSec didn't detect any outbound interface
There is no WAN interface available for this connection
Please don't forget to rate,
David Castro,