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Port 2443 (powerclientcsf)

IANA assigns port 2443 to powerclientcsf: PowerClient Central Storage Facility.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
powerclientcsf TCP PowerClient Central Storage Facility Brian Klassen -
powerclientcsf UDP PowerClient Central Storage Facility Brian Klassen -

Check what is listening on port 2443

Linux: is anything listening on TCP 2443?
sudo ss -tlnp 'sport = :2443'
Linux: UDP 2443
sudo ss -ulnp 'sport = :2443'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2443
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2443 '
Windows (Command Prompt)
netstat -ano | findstr :2443
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2443 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2443
From Windows
Test-NetConnection HOST -Port 2443
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2443

Block port 2443 in the firewall

ufw
sudo ufw deny 2443/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2443 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2443' -Direction Inbound -Protocol TCP -LocalPort 2443 -Action Block
ufw
sudo ufw deny 2443/udp
iptables
sudo iptables -A INPUT -p udp --dport 2443 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2443' -Direction Inbound -Protocol UDP -LocalPort 2443 -Action Block

Related ports

2441pvsw-inet2442netangel2444btpp2sectrans2445dtn1

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