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// Other services

Port 3670: SMILE TCP/UDP Interface

Port 3670 is assigned by IANA to smile (SMILE TCP/UDP Interface).

3670

How smile works

Other services
client:3670smileresponse client:3670smileresponse

The client sends a request to port 3670 and the smile 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 3670 dangerous?

We have no specific security note for port 3670. 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 3670

ServicePortTransportDescriptionReferenceUpdated
smile 3670 TCP, UDP SMILE TCP/UDP Interface - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3670, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3670'      # process listening on 3670
sudo lsof -nP -i :3670

macOS

sudo lsof -nP -i :3670

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3670 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3670
netstat -ano | findstr :3670

From another machine

nmap -p 3670 -sV <host>
sudo nmap -sU -p 3670 <host>
nc -zv <host> 3670

Block it in the firewall

sudo ufw deny 3670/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3670" -Direction Inbound -LocalPort 3670 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3670 used for?

Port 3670 is assigned by IANA to smile (SMILE TCP/UDP Interface).

Is port 3670 TCP or UDP?

Port 3670 is registered for TCP and UDP.

Is it safe to open port 3670?

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 3670 is open?

On Linux run "ss -ltnup 'sport = :3670'", on macOS "lsof -nP -i :3670", and on Windows "netstat -ano | findstr :3670" to see the local process. From another machine, "nmap -p 3670 <host>" shows whether it is reachable.

05 Related
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