Consul's server RPC port — how agents and servers talk to the cluster leader.
IANA registers 8300 as tmi, "Transport Management Interface", from 2006, but in practice a listener here is HashiCorp Consul: 8300/tcp is the server RPC port that Consul documents as "Consul internal communication with servers", used for client-to-server and server-to-server RPC and Raft traffic. It appears on Consul server nodes, which usually also show 8301/8302 (Serf LAN/WAN), 8500 (HTTP API) and 8600 (DNS). Seeing 8300 without those neighbours means you are probably not looking at Consul.
Do not expose
This is the cluster's internal control channel. Reachable from the internet it is a path to the Raft log and the whole catalog; keep it on a private network with TLS and gossip encryption enabled.
$ sudo lsof -nP -iTCP:8300 -sTCP:LISTENSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.