vpn clients connect but have no acess to internal resources in TMG 2010

Hi everyone

I recently installed TMG 2010 SP1 as firewall and vpn server in my network , I configured its VPN server to work with PPTP and L2TP with pre shared key , now the problem is that at first my clients connect to VPN server but they had no access or even reply with ping of my internal resources , so I added below rule to my TMG rules

  name                     protocol                    from             to              users

vpn clients     all outbound protocol    vpn clients      internal      all users

now vpn clients have reply from internal resources when pinging them and even they can have remote desktop connection to servers but still they don't have access to shared files in internal network and they can't connect to any station with \\computer name 

if anyone has any solution or experience with this please let my know

thanks