Port 8500: Consul
Port 8500 is the HTTP API and web UI port for HashiCorp Consul, a service discovery and health-checking tool used to keep track of what services are running where. Consul also uses separate ports for DNS and internal cluster gossip.
| Port number | 8500 |
|---|---|
| Service | HashiCorp Consul HTTP API / UI |
| Protocol | TCP |
| Category | Infrastructure & orchestration |
| Default encryption | No |
How do I check whether port 8500 is open?
Port 8500 carries TCP, so a connection either completes its handshake or it does not, which makes the check definitive.
| Question | Command | What to know |
|---|---|---|
| Is it open on a remote host? | nc -vz example.com 8500 | A TCP handshake either completes or it does not, so netcat gives a definitive answer in one line. |
| Same check on Windows | Test-NetConnection example.com -Port 8500 | Built into PowerShell. TcpTestSucceeded in the output is the answer; telnet is not installed by default on modern Windows. |
| What is listening locally? | ss -tlnp | grep ':8500 ' | Lists the process bound to port 8500 on Linux. On macOS use lsof -nP -iTCP:8500 -sTCP:LISTEN, on Windows netstat -ano | findstr :8500 |
Replace example.com with the host you are testing. A blocked port and a port with nothing listening on it look identical from the outside, so if a service should be running, check locally before blaming the firewall.
Frequently asked questions
What is port 8500 used for?
Port 8500 is the HTTP API and web UI port for HashiCorp Consul, a service discovery and health-checking tool used to keep track of what services are running where. Consul also uses separate ports for DNS and internal cluster gossip.
Is port 8500 TCP or UDP?
Port 8500 (Consul) uses TCP.
Is port 8500 secure?
Port 8500 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 8500 on my firewall?
Only if you specifically need Consul. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.