Hi Fabio,
The reason is most likely due to the second appliance not having a trial loaded. The second license was sent after the forum post. But since this a very common scenario and someone else might find this post with the same question, here are a few things to check:
Assuming a fresh install with two appliances/VM's in bridge mode and only IP addresses are added as the only config so far:
1) Load trial licenses on both sides. Check license status.
2) Check that wan0 interfaces point to each other. lan0 interfaces connect to the test workstations.
3) Wanos appliance/VM's have at least 2GB RAM. If any peers are in the peer status that should not be there, delete them.
4) Start a few TCP sessions from the test machines. Windows machines may need a reboot before start testing. Alternatively test between wanos appliances with this trick: From Wanos-A command line run:
wget http://wanos-b-ip/
5) Once peers show up on both sides, then start testing with larger files.
In a lab/test environment this should always be the bare minimum to get the peers up and start testing optimization. For deployments that involves firewalls there is a more comprehensive troubleshooting guide here:
Peer Down | Optimization not working | No Optimization