This could be a few things, most likely that port 4172 UDP/TCP is not opened in the firewall.
Some other possible reasons are:
Not configured the PCoIP Tunnel correctly, have a look at the config options for the connection broker.
Not choosing the correct protocol, there is RDP and PCoIP to choose from.
I would strongly recommend not to use IP:s, use proper FQDN:s instead, you will never be able to secure it or loadbalance properly if using IP:s.
// Linjo