I have set up my pda to connect to my home wi-fi network (wi-fi router), which works fine. But sometimes when I am out of home I would like to use the "simply" ad-hoc pda to pc connection and there is some problem.

I am in the phase when both pc and pda indicate that they are ad-hoc connected, but I can access neither internet nor shared folders on pc from pda. (Firewall is down, so it can not be blocking the communication.)

What to check?