I had an existing setup with a 5515-X serving as my firewall and VPN, which worked fine. Since moving to a new location, and thus a new outside interface IP, I can successfully connect to the VPN, but nothing is visible to the VPN client (i.e., cannot reach anything inside the network). I suspected that UDP 500 might be blocked, but the ISP insists that it is not. (The ISP is managing a Cisco 3900 to bring internet in.) There are no appliances between the 3900 and the ASA. I should just be able to change the outside interface's address, and it should plug and play.
Any ideas why the setup is not working?
EDIT: I can now reach the inside interface of the ASA via Telnet, and I can connect to it, but I cannot see anything else on the network. The VPN allocates me an IP address, and I stay connected. Something is amiss with the VPN configuration, even though nothing has changed with it (except the outside IP address).