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// Other services

Port 1541: rds2

Port 1541 is assigned by IANA to rds2 (rds2).

1541

How rds2 works

Other services
client:1541rds2response client:1541rds2response

The client sends a request to port 1541 and the rds2 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
01 Security

Is port 1541 dangerous?

We have no specific security note for port 1541. Its risk depends on the program actually listening on it. General advice for other services services:

  • 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.
02 Registry

IANA registry entries for port 1541

ServicePortTransportDescriptionReferenceUpdated
rds2 1541 TCP, UDP rds2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1541, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1541'      # process listening on 1541
sudo lsof -nP -i :1541

macOS

sudo lsof -nP -i :1541

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1541 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1541
netstat -ano | findstr :1541

From another machine

nmap -p 1541 -sV <host>
sudo nmap -sU -p 1541 <host>
nc -zv <host> 1541

Block it in the firewall

sudo ufw deny 1541/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1541" -Direction Inbound -LocalPort 1541 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1541 used for?

Port 1541 is assigned by IANA to rds2 (rds2).

Is port 1541 TCP or UDP?

Port 1541 is registered for TCP and UDP.

Is it safe to open port 1541?

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 1541 is open?

On Linux run "ss -ltnup 'sport = :1541'", on macOS "lsof -nP -i :1541", and on Windows "netstat -ano | findstr :1541" to see the local process. From another machine, "nmap -p 1541 <host>" shows whether it is reachable.

05 Related
: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

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