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Port 3660 (can-nds-ssl)

IANA assigns port 3660 to can-nds-ssl: IBM Tivoli Directory Service using SSL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
can-nds-ssl TCP IBM Tivoli Directory Service using SSL - -
can-nds-ssl UDP IBM Tivoli Directory Service using SSL - -

Check what is listening on port 3660

Linux: is anything listening on TCP 3660?
sudo ss -tlnp 'sport = :3660'
Linux: UDP 3660
sudo ss -ulnp 'sport = :3660'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3660
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3660 '
Windows (Command Prompt)
netstat -ano | findstr :3660
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3660 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3660
From Windows
Test-NetConnection HOST -Port 3660
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3660

Block port 3660 in the firewall

ufw
sudo ufw deny 3660/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3660 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3660' -Direction Inbound -Protocol TCP -LocalPort 3660 -Action Block
ufw
sudo ufw deny 3660/udp
iptables
sudo iptables -A INPUT -p udp --dport 3660 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3660 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3660' -Direction Inbound -Protocol UDP -LocalPort 3660 -Action Block

Related ports

3658ps-ams3659apple-sasl3661can-ferret-ssl3662pserver

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