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Port 3397 (cloanto-lm)

IANA assigns port 3397 to cloanto-lm: Cloanto License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cloanto-lm TCP Cloanto License Manager Takeo Sato -
cloanto-lm UDP Cloanto License Manager Takeo Sato -

Registry dates for this port: registered 2010-04-30.

Check what is listening on port 3397

Linux: is anything listening on TCP 3397?
sudo ss -tlnp 'sport = :3397'
Linux: UDP 3397
sudo ss -ulnp 'sport = :3397'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3397
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3397 '
Windows (Command Prompt)
netstat -ano | findstr :3397
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3397 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3397
From Windows
Test-NetConnection HOST -Port 3397
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3397

Block port 3397 in the firewall

ufw
sudo ufw deny 3397/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3397 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3397 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3397' -Direction Inbound -Protocol TCP -LocalPort 3397 -Action Block
ufw
sudo ufw deny 3397/udp
iptables
sudo iptables -A INPUT -p udp --dport 3397 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3397 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3397' -Direction Inbound -Protocol UDP -LocalPort 3397 -Action Block

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3395dyna-lm3396printer-agent, printer_agent3398mercantile3399csms

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.