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// Other services

Port 1659: Silicon Grail License Manager

Port 1659 is assigned by IANA to sg-lm (Silicon Grail License Manager).

1659

How sg-lm works

Other services
client:1659sg-lmresponse client:1659sg-lmresponse

The client sends a request to port 1659 and the sg-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 1659 dangerous?

We have no specific security note for port 1659. 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 1659

ServicePortTransportDescriptionReferenceUpdated
sg-lm 1659 TCP, UDP Silicon Grail License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1659, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1659'      # process listening on 1659
sudo lsof -nP -i :1659

macOS

sudo lsof -nP -i :1659

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1659 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1659
netstat -ano | findstr :1659

From another machine

nmap -p 1659 -sV <host>
sudo nmap -sU -p 1659 <host>
nc -zv <host> 1659

Block it in the firewall

sudo ufw deny 1659/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1659" -Direction Inbound -LocalPort 1659 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1659 used for?

Port 1659 is assigned by IANA to sg-lm (Silicon Grail License Manager).

Is port 1659 TCP or UDP?

Port 1659 is registered for TCP and UDP.

Is it safe to open port 1659?

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 1659 is open?

On Linux run "ss -ltnup 'sport = :1659'", on macOS "lsof -nP -i :1659", and on Windows "netstat -ano | findstr :1659" to see the local process. From another machine, "nmap -p 1659 <host>" shows whether it is reachable.

05 Related
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