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// Other services

Port 1557: ArborText License Manager

Port 1557 is assigned by IANA to arbortext-lm (ArborText License Manager).

1557

How arbortext-lm works

Other services
client:1557arbortext-lmresponse client:1557arbortext-lmresponse

The client sends a request to port 1557 and the arbortext-lm 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 1557 dangerous?

We have no specific security note for port 1557. 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 1557

ServicePortTransportDescriptionReferenceUpdated
arbortext-lm 1557 TCP, UDP ArborText License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1557, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1557'      # process listening on 1557
sudo lsof -nP -i :1557

macOS

sudo lsof -nP -i :1557

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1557 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1557
netstat -ano | findstr :1557

From another machine

nmap -p 1557 -sV <host>
sudo nmap -sU -p 1557 <host>
nc -zv <host> 1557

Block it in the firewall

sudo ufw deny 1557/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1557" -Direction Inbound -LocalPort 1557 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1557 used for?

Port 1557 is assigned by IANA to arbortext-lm (ArborText License Manager).

Is port 1557 TCP or UDP?

Port 1557 is registered for TCP and UDP.

Is it safe to open port 1557?

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 1557 is open?

On Linux run "ss -ltnup 'sport = :1557'", on macOS "lsof -nP -i :1557", and on Windows "netstat -ano | findstr :1557" to see the local process. From another machine, "nmap -p 1557 <host>" shows whether it is reachable.

05 Related
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