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Port 7199 (Cassandra JMX)

Cassandra JMX port used by nodetool.

Registered (user) port, 1024-49151 TCP Databases Localhost or LAN only

What port 7199 is used for

Cassandra JMX port used by nodetool.

Security: should port 7199 be open?

Localhost or LAN only. Unauthenticated JMX means remote code execution; keep it on localhost.

IANA assignment

Port 7199 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Check what is listening on port 7199

Linux: is anything listening on TCP 7199?
sudo ss -tlnp 'sport = :7199'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7199
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7199 '
Windows (Command Prompt)
netstat -ano | findstr :7199
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7199 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7199
From Windows
Test-NetConnection HOST -Port 7199

Block port 7199 in the firewall

ufw
sudo ufw deny 7199/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7199 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7199 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7199' -Direction Inbound -Protocol TCP -LocalPort 7199 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.