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// Other services

Port 1455: ESL License Manager

Port 1455 is assigned by IANA to esl-lm (ESL License Manager).

1455

How esl-lm works

Other services
client:1455esl-lmresponse client:1455esl-lmresponse

The client sends a request to port 1455 and the esl-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 1455 dangerous?

We have no specific security note for port 1455. 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 1455

ServicePortTransportDescriptionReferenceUpdated
esl-lm 1455 TCP, UDP ESL License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1455, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1455'      # process listening on 1455
sudo lsof -nP -i :1455

macOS

sudo lsof -nP -i :1455

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1455 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1455
netstat -ano | findstr :1455

From another machine

nmap -p 1455 -sV <host>
sudo nmap -sU -p 1455 <host>
nc -zv <host> 1455

Block it in the firewall

sudo ufw deny 1455/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1455" -Direction Inbound -LocalPort 1455 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1455 used for?

Port 1455 is assigned by IANA to esl-lm (ESL License Manager).

Is port 1455 TCP or UDP?

Port 1455 is registered for TCP and UDP.

Is it safe to open port 1455?

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 1455 is open?

On Linux run "ss -ltnup 'sport = :1455'", on macOS "lsof -nP -i :1455", and on Windows "netstat -ano | findstr :1455" to see the local process. From another machine, "nmap -p 1455 <host>" shows whether it is reachable.

05 Related
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