HTTPfy

Port 3112 (ksysguard)

IANA assigns port 3112 to ksysguard: KDE System Guard.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ksysguard TCP KDE System Guard Chris Schlaeger -
ksysguard UDP KDE System Guard Chris Schlaeger -

Check what is listening on port 3112

Linux: is anything listening on TCP 3112?
sudo ss -tlnp 'sport = :3112'
Linux: UDP 3112
sudo ss -ulnp 'sport = :3112'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3112
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3112 '
Windows (Command Prompt)
netstat -ano | findstr :3112
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3112 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3112
From Windows
Test-NetConnection HOST -Port 3112
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3112

Block port 3112 in the firewall

ufw
sudo ufw deny 3112/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3112 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3112 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3112' -Direction Inbound -Protocol TCP -LocalPort 3112 -Action Block
ufw
sudo ufw deny 3112/udp
iptables
sudo iptables -A INPUT -p udp --dport 3112 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3112 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3112' -Direction Inbound -Protocol UDP -LocalPort 3112 -Action Block

Related ports

3110sim-control3111wsynch3113cs-auth-svr3114ccmad

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