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Port 2827 (slc-ctrlrloops)

IANA assigns port 2827 to slc-ctrlrloops: slc ctrlrloops.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
slc-ctrlrloops TCP slc ctrlrloops Erwin Hogeweg -
slc-ctrlrloops UDP slc ctrlrloops Erwin Hogeweg -

Check what is listening on port 2827

Linux: is anything listening on TCP 2827?
sudo ss -tlnp 'sport = :2827'
Linux: UDP 2827
sudo ss -ulnp 'sport = :2827'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2827
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2827 '
Windows (Command Prompt)
netstat -ano | findstr :2827
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2827 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2827
From Windows
Test-NetConnection HOST -Port 2827
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2827

Block port 2827 in the firewall

ufw
sudo ufw deny 2827/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2827 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2827 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2827' -Direction Inbound -Protocol TCP -LocalPort 2827 -Action Block
ufw
sudo ufw deny 2827/udp
iptables
sudo iptables -A INPUT -p udp --dport 2827 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2827 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2827' -Direction Inbound -Protocol UDP -LocalPort 2827 -Action Block

Related ports

2824cqg-netlan-12826slc-systemlog2828itm-lm2829silkp1

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