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Port 1127 (kwdb-commn)

IANA assigns port 1127 to kwdb-commn: KWDB Remote Communication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
kwdb-commn TCP KWDB Remote Communication Lal Samuel Varghese -
kwdb-commn UDP KWDB Remote Communication Lal Samuel Varghese -

Registry dates for this port: registered 2005-08.

Check what is listening on port 1127

Linux: is anything listening on TCP 1127?
sudo ss -tlnp 'sport = :1127'
Linux: UDP 1127
sudo ss -ulnp 'sport = :1127'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1127
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1127 '
Windows (Command Prompt)
netstat -ano | findstr :1127
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1127 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1127
From Windows
Test-NetConnection HOST -Port 1127
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1127

Block port 1127 in the firewall

ufw
sudo ufw deny 1127/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1127 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1127 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1127' -Direction Inbound -Protocol TCP -LocalPort 1127 -Action Block
ufw
sudo ufw deny 1127/udp
iptables
sudo iptables -A INPUT -p udp --dport 1127 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1127 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1127' -Direction Inbound -Protocol UDP -LocalPort 1127 -Action Block

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