Hi Hassan.
not sure what you mean by inside to inside vpn, can you please elaborate?
can you provide the client routing table after you connect? (route print from command prompt).
portmap creation failures, usually mean there is a NAT Issue. however usually you don't do NAT when doing vpn client configuration. you use something called nat exemption. here is a sample configuration for vpn clients to ASA:
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a008080f2d1.shtml
notice from the example the nat exemption part for the vpn client traffic:
access-list 101 extended permit ip 172.16.0.0 255.255.0.0 10.16.20.0 255.255.255.0
ip local pool vpnclient 10.16.20.1-10.16.20.5
nat (inside) 0 access-list 101
if you still can't fix it, then please provide the config (remember to erase the parts you don't want others to see).
let me know if this helps.
Regards,
Fadi.