HTTPfy

Port 2003 (Graphite (Carbon plaintext))

Carbon plaintext metric ingestion for Graphite; 2004 is the pickle protocol.

Registered (user) port, 1024-49151 TCP Monitoring and logging Do not expose to the internet

What port 2003 is used for

Carbon plaintext metric ingestion for Graphite; 2004 is the pickle protocol.

Security: should port 2003 be open?

Do not expose to the internet. Unauthenticated writes; keep internal.

IANA assignment

Service nameProtoDescriptionAssigneeReference
brutus TCP Brutus Server Johannes Skov Frands -
brutus UDP Brutus Server Johannes Skov Frands -

Registry dates for this port: registered 2008-02-28.

Check what is listening on port 2003

Linux: is anything listening on TCP 2003?
sudo ss -tlnp 'sport = :2003'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2003
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2003 '
Windows (Command Prompt)
netstat -ano | findstr :2003
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2003 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2003
From Windows
Test-NetConnection HOST -Port 2003

Block port 2003 in the firewall

ufw
sudo ufw deny 2003/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2003 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2003 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2003' -Direction Inbound -Protocol TCP -LocalPort 2003 -Action Block

Related ports

8125StatsD3000Grafana / development servers2000cisco-sccp2001wizard2004emce2006raid-cd

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