Hi,
Try this and see if it works.
replace
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map_2
with
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
and add this
vpngroup RAS dns-server dns1 dns2
dns1 and dns2 will be the dns you use. I know the dns might not matter, but there's no harm in trying.
D