new node to asa vpn not working

i have asa 5505 ver 7.2 with sit-to-site VPN tunnel working fine , but when i add another ip to the existing ips in the same vpn rule the new ip not working it gives “Destination host unreachable”
i have enabled debug with putty using :
debug crypto ipsec enabled at level 200
debug crypto isakmp enabled at level 200
but nothing appeared in the screen screen