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Port 3145 (csi-lfap)

IANA assigns port 3145 to csi-lfap: CSI-LFAP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
csi-lfap TCP CSI-LFAP Paul Amsden -
csi-lfap UDP CSI-LFAP Paul Amsden -

Check what is listening on port 3145

Linux: is anything listening on TCP 3145?
sudo ss -tlnp 'sport = :3145'
Linux: UDP 3145
sudo ss -ulnp 'sport = :3145'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3145
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3145 '
Windows (Command Prompt)
netstat -ano | findstr :3145
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3145 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3145
From Windows
Test-NetConnection HOST -Port 3145
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3145

Block port 3145 in the firewall

ufw
sudo ufw deny 3145/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3145 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3145 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3145' -Direction Inbound -Protocol TCP -LocalPort 3145 -Action Block
ufw
sudo ufw deny 3145/udp
iptables
sudo iptables -A INPUT -p udp --dport 3145 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3145 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3145' -Direction Inbound -Protocol UDP -LocalPort 3145 -Action Block

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