Ipsec vpn works from mikrotik and not from windows clients

Hi

I’ve configured a ipsec vpn following this guide:

https://wiki.mikrotik.com/wiki/MikroTik_router_to_CISCO_PIX_Firewall_IPSEC

All seems works from mikrotik.
I have telnet from mikrotik to cisco remote internal network but not from windows clients in the local network.
Any clues to what may be happening?
Thanks in advance

roberto