Each failover system Server uses the following ports:

• 4000 (Supervisor Web-Interface, only TCP),
• 4646 (Nomad HTTP API, only TCP),
• 4647 (Nomad RPC, only TCP),
• 4648 (Nomad LAN/WAN Serf (Gossip), TCP and UDP),
• 8300 (Consul Server RPC, only TCP),
• 8301 (Consul LAN Serf (Gossip), TCP and UDP),
• 8302 (Consul WAN Serf (Gossip), TCP and UDP),
• 8500 (Consul HTTP API, only TCP),
• 8600 (Consul DNS, TCP and UDP).

Moreover, each node of the cluster has its pre-defined unique port range (see Installation).
For best results, use port numbers from 20111 to 32000.