Scott,

>
>I have two devices a Pix running the 7.x code base in the field and a pair of 
>ASA 5520 devices running 8.2.2.  
>The 5520 pair is set up in an active passive arrangement.

Which version of 7.x are you running.  7.2.4 below interim 33 was very buggy 
with VPNs.  They stop for no reason and removing the crypto map completely and 
re-applying it does not fix it.   Try the following if you don't plan to 
upgrade soon:

Enable logging class vpn monitor debugging, clear isakmp sa on both sides.  The 
receiver of the tunnel is going to have the most useful debugs and if you don't 
have access to the devices on either side, use packet-tracer to simulate 
interesting traffic.  Try initiating from both sides, if you still aren't 
getting anywhere, remove and add back the crypto map from the outside 
interface.   Debug cry isa 255 and debug cry ipsec 255 should also help.  
Beyond that, a reboot will clear up the 7.2.4 bug.

-ryan


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