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// Other services

Port 5081: SDL - Ent Trans Server

Port 5081 is assigned by IANA to sdl-ets (SDL - Ent Trans Server).

5081

How sdl-ets works

Other services
client:5081sdl-etsresponse client:5081sdl-etsresponse

The client sends a request to port 5081 and the sdl-ets 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 5081 dangerous?

We have no specific security note for port 5081. 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 5081

ServicePortTransportDescriptionReferenceUpdated
sdl-ets 5081 TCP, UDP SDL - Ent Trans Server - 2002-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 5081, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5081'      # process listening on 5081
sudo lsof -nP -i :5081

macOS

sudo lsof -nP -i :5081

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5081 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5081
netstat -ano | findstr :5081

From another machine

nmap -p 5081 -sV <host>
sudo nmap -sU -p 5081 <host>
nc -zv <host> 5081

Block it in the firewall

sudo ufw deny 5081/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5081" -Direction Inbound -LocalPort 5081 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5081 used for?

Port 5081 is assigned by IANA to sdl-ets (SDL - Ent Trans Server).

Is port 5081 TCP or UDP?

Port 5081 is registered for TCP and UDP.

Is it safe to open port 5081?

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 5081 is open?

On Linux run "ss -ltnup 'sport = :5081'", on macOS "lsof -nP -i :5081", and on Windows "netstat -ano | findstr :5081" to see the local process. From another machine, "nmap -p 5081 <host>" shows whether it is reachable.

05 Related
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