I see several posts on this subject have been added already, but I thought I would add my 2c.
I've been trying to get a remote IPsec VPN(Cisco client) connecting from the inside of our office ASA to a remote ASA.
The client would connect fine, but no traffic would pass through the VPN.
This is what I would see in show logging asdm
305006: regular translation creation failed for protocol 50 src INSIDE_Gi1/2.2:192.168.x.x dst OUTSIDE_Gi0/0.60:x.x.x.x
To fix this I enabled "inspect ip-pass-through" under the global policy inspection map on the local ASA , and added "crypto isakmp nat-traversal" to the remote ASA.