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// Other services

Port 3659: Apple SASL

Port 3659 is assigned by IANA to apple-sasl (Apple SASL).

3659

How apple-sasl works

Other services
client:3659apple-saslresponse client:3659apple-saslresponse

The client sends a request to port 3659 and the apple-sasl 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 3659 dangerous?

We have no specific security note for port 3659. 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 3659

ServicePortTransportDescriptionReferenceUpdated
apple-sasl 3659 TCP, UDP Apple SASL - 2003-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 3659, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3659'      # process listening on 3659
sudo lsof -nP -i :3659

macOS

sudo lsof -nP -i :3659

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3659 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3659
netstat -ano | findstr :3659

From another machine

nmap -p 3659 -sV <host>
sudo nmap -sU -p 3659 <host>
nc -zv <host> 3659

Block it in the firewall

sudo ufw deny 3659/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3659" -Direction Inbound -LocalPort 3659 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3659 used for?

Port 3659 is assigned by IANA to apple-sasl (Apple SASL).

Is port 3659 TCP or UDP?

Port 3659 is registered for TCP and UDP.

Is it safe to open port 3659?

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 3659 is open?

On Linux run "ss -ltnup 'sport = :3659'", on macOS "lsof -nP -i :3659", and on Windows "netstat -ano | findstr :3659" to see the local process. From another machine, "nmap -p 3659 <host>" shows whether it is reachable.

05 Related
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