Howdy, I'm looking to find out if it is possible to build an IPSec tunnel on a multi-security context ASA5520? If not, what are the alternate solutions to build tunnels between sites on a multi-context ASA? Thanks in advance for any info.
When you use multiple security contexts on the ASA it disables all VPN functionality as described here:
If you need multiple contexts there is not going to be a way for you to terminate your VPN connection at the ASA. What other switching & routing gear do you have on-site? You might be able to take advantage of IOS VPN functionality of these devices.
The Multi Context mode in the ASA does not support VPN. For a workaround you might have to tunnel on devices other than the Multi Context ASAs. Here is the official doc from CISCO side http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/contexts.html#wp1116132
Unfortunately, ASA in mulitlpe mode does not support VPN:
What exactly is your requirement? We can then maybe think of alternatives. One would be to have another device in front of this ASA to terminate the VPN.