ASA not getting address as DHCP client

[Doyle Mathews]

I just changed to Charter Internet and want to connect my ASA 505 directly to the cable modem.  However, when I do, the ASA never gets an IP address. 

My outside interface is configured as such:

interface Vlan2
 nameif outside
 security-level 0
 ip address dhcp setroute  
!

The strange thing is if I connect my PC or a Linksys router to the cable modem, they both get an address with no problem.

[Doyle Mathews]

No one has put an ASA behind a Charter modem before? :)