Fortinet VPN - unable to ping, but http passes over VPN

Hello all,

I have two fortigate devices with configured policy-based VPN.

http://docs.fortinet.com/cb/html/index.html#page/FOS_Cookbook/IPSec/cb_ipsecvpn_fgt_basic.html

Tunnel is up, but some problems are present.

I can ping LAN interfaces of Fortigate on both LANs

I cannot ping any devices on LAN behind fortigates

I cannot access windows shared folders, eg. \\server\share or \\192.168.x.x\share

But I can access PC's and webcams via HTTP on the LAN on both sides.

What can be the problem?