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Port 3659 (apple-sasl)

IANA assigns port 3659 to apple-sasl: Apple SASL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
apple-sasl TCP Apple SASL David M O Rourke -
apple-sasl UDP Apple SASL David M O Rourke -

Registry dates for this port: registered 2003-01.

Check what is listening on port 3659

Linux: is anything listening on TCP 3659?
sudo ss -tlnp 'sport = :3659'
Linux: UDP 3659
sudo ss -ulnp 'sport = :3659'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3659
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3659 '
Windows (Command Prompt)
netstat -ano | findstr :3659
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3659 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3659
From Windows
Test-NetConnection HOST -Port 3659
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3659

Block port 3659 in the firewall

ufw
sudo ufw deny 3659/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3659 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3659 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3659' -Direction Inbound -Protocol TCP -LocalPort 3659 -Action Block
ufw
sudo ufw deny 3659/udp
iptables
sudo iptables -A INPUT -p udp --dport 3659 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3659 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3659' -Direction Inbound -Protocol UDP -LocalPort 3659 -Action Block

Related ports

3657immedianet-bcn3658ps-ams3660can-nds-ssl3661can-ferret-ssl

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.