We had a working IPSec connection with another location.  On our end, we replaced an old Pix 515 with a new ASA 5520 and since then, the tunnel will not come up with the following in the log:IP = x.x.75.65, Information Exchange processing failedIP = ...

I'm trying to set up an 802.1 q trunk between my layer 3 switch and ASA5520.  I understand I need to create a subinterface to accomplish this and have done so.  However, the subinterface does not respond to pings, and when I attempt to run the packet...