Port 8200 Vault · TCP

What runs on port 8200

HashiCorp Vault's API and UI. Vault holds secrets for everything else, so this port gets TLS, an audit device and network restrictions before anything connects. Also used by GoToMyPC and by MiniDLNA for media serving, so check what answers.

Software that uses it: HashiCorp Vault / OpenBao · MiniDLNA (ReadyMedia) · GoToMyPC

Should port 8200 be open?

Private network or VPN only. Nothing good comes from this port being reachable from the internet. Keep it on an internal network, reach it over a VPN or an SSH tunnel, and firewall it from everything that does not need it.

• curl -s https://vault:8200/v1/sys/health tells you sealed/unsealed and standby status; 8201 is cluster traffic.

Check port 8200

# on the host: is anything listening, and which process?
ss -ltnp 'sport = :8200'
sudo lsof -i :8200

# from another machine: is it reachable?
nc -zv host 8200
nmap -p 8200 host
curl -v telnet://host:8200      # raw TCP connect test, Ctrl-C to leave

A port that answers from the internet when it should not is the finding; nmap from a machine outside your network (or a VPS) is the honest test, because scans from inside the LAN pass the firewall you are trying to verify.

Allow or block port 8200

# ufw (Ubuntu/Debian)
sudo ufw allow from 10.0.0.0/8 to any port 8200 proto tcp
sudo ufw deny 8200/tcp

# nftables
nft add rule inet filter input ip saddr 10.0.0.0/8 tcp dport 8200 accept
nft add rule inet filter input tcp dport 8200 drop

# iptables (legacy)
iptables -A INPUT -p tcp --dport 8200 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 8200 -j DROP

# firewalld
sudo firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address=10.0.0.0/8 port port=8200 protocol=tcp accept'

Replace 10.0.0.0/8 with the networks that need access. Allowing by source address is the rule that matters; "allow 8200" with no source is just "open".

Related ports

• 8500 Consul
• 443 HTTPS — Web over TLS; UDP for HTTP/3 (QUIC)

Part of the port number reference. Ports are 16-bit numbers; see also the subnet calculator and the packet decoder, which shows ports inside TCP and UDP headers.

Questions