NW6.5sp1, BM3.8, iManager2

VPN C2S has beed configured on the server.
Client has public IP address. The VPN connection has been established by VPN
client. So the client is authenticated to the server correctly.
The trouble is the client can't ping any ip address, even of the server. He
can't ping public or private ip of the server and any ip from private LAN
behing VPN server. The traffic rule is created on the server to permit to
all hosts as destination.
Why it not works?