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// Other services

Port 6142: Aspen Technology License Manager

Port 6142 is assigned by IANA to aspentec-lm (Aspen Technology License Manager).

6142

How aspentec-lm works

Other services
client:6142aspentec-lmresponse client:6142aspentec-lmresponse

The client sends a request to port 6142 and the aspentec-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 6142 dangerous?

We have no specific security note for port 6142. 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 6142

ServicePortTransportDescriptionReferenceUpdated
aspentec-lm 6142 TCP, UDP Aspen Technology License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 6142, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6142'      # process listening on 6142
sudo lsof -nP -i :6142

macOS

sudo lsof -nP -i :6142

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6142 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6142
netstat -ano | findstr :6142

From another machine

nmap -p 6142 -sV <host>
sudo nmap -sU -p 6142 <host>
nc -zv <host> 6142

Block it in the firewall

sudo ufw deny 6142/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6142" -Direction Inbound -LocalPort 6142 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6142 used for?

Port 6142 is assigned by IANA to aspentec-lm (Aspen Technology License Manager).

Is port 6142 TCP or UDP?

Port 6142 is registered for TCP and UDP.

Is it safe to open port 6142?

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 6142 is open?

On Linux run "ss -ltnup 'sport = :6142'", on macOS "lsof -nP -i :6142", and on Windows "netstat -ano | findstr :6142" to see the local process. From another machine, "nmap -p 6142 <host>" shows whether it is reachable.

05 Related
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