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// Other services

Port 4786: Smart Install Service

Port 4786 is assigned by IANA to smart-install (Smart Install Service).

4786

How smart-install works

Other services
client:4786smart-installresponse client:4786smart-installresponse

The client sends a request to port 4786 and the smart-install service answers.

Transport
TCP
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 4786 dangerous?

We have no specific security note for port 4786. 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 4786

ServicePortTransportDescriptionReferenceUpdated
smart-install 4786 TCP Smart Install Service - 2009-08-24
-4786-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4786, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4786'      # process listening on 4786
sudo lsof -nP -i :4786

macOS

sudo lsof -nP -i :4786

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4786 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4786
netstat -ano | findstr :4786

From another machine

nmap -p 4786 -sV <host>
nc -zv <host> 4786

Block it in the firewall

sudo ufw deny 4786/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4786" -Direction Inbound -LocalPort 4786 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4786 used for?

Port 4786 is assigned by IANA to smart-install (Smart Install Service).

Is port 4786 TCP or UDP?

Port 4786 is registered for TCP.

Is it safe to open port 4786?

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 4786 is open?

On Linux run "ss -ltnup 'sport = :4786'", on macOS "lsof -nP -i :4786", and on Windows "netstat -ano | findstr :4786" to see the local process. From another machine, "nmap -p 4786 <host>" shows whether it is reachable.

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