- Close the port if nothing on the host needs it.
- Identify the process that listens on it (commands below) before opening it in a firewall.
- Expose a service only to the networks that use it.
Port 2003: Brutus Server
Port 2003 is assigned by IANA to brutus (Brutus Server).
2003
How brutus works
Other servicesThe client sends a request to port 2003 and the brutus service answers.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- Other services
Is port 2003 dangerous?
We have no specific security note for port 2003. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 2003
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| brutus | 2003 | TCP, UDP | Brutus Server | - | 2008-02-28 |
// source: IANA service name and port number registry
Which program uses port 2003, and is it reachable?
Linux
sudo ss -ltnup 'sport = :2003' # process listening on 2003
sudo lsof -nP -i :2003macOS
sudo lsof -nP -i :2003
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2003 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 2003 netstat -ano | findstr :2003
From another machine
nmap -p 2003 -sV <host> sudo nmap -sU -p 2003 <host> nc -zv <host> 2003
Block it in the firewall
sudo ufw deny 2003/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 2003" -Direction Inbound -LocalPort 2003 -Protocol TCP -Action Block # Windows
What is port 2003 used for?
Port 2003 is assigned by IANA to brutus (Brutus Server).
Is port 2003 TCP or UDP?
Port 2003 is registered for TCP and UDP.
Is it safe to open port 2003?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.
How do I check if port 2003 is open?
On Linux run "ss -ltnup 'sport = :2003'", on macOS "lsof -nP -i :2003", and on Windows "netstat -ano | findstr :2003" to see the local process. From another machine, "nmap -p 2003 <host>" shows whether it is reachable.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp