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// Other services

Port 1127: KWDB Remote Communication

Port 1127 is assigned by IANA to kwdb-commn (KWDB Remote Communication).

1127

How kwdb-commn works

Other services
client:1127kwdb-commnresponse client:1127kwdb-commnresponse

The client sends a request to port 1127 and the kwdb-commn service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1127 dangerous?

We have no specific security note for port 1127. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 1127

ServicePortTransportDescriptionReferenceUpdated
kwdb-commn 1127 TCP, UDP KWDB Remote Communication - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 1127, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1127'      # process listening on 1127
sudo lsof -nP -i :1127

macOS

sudo lsof -nP -i :1127

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1127 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1127
netstat -ano | findstr :1127

From another machine

nmap -p 1127 -sV <host>
sudo nmap -sU -p 1127 <host>
nc -zv <host> 1127

Block it in the firewall

sudo ufw deny 1127/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1127" -Direction Inbound -LocalPort 1127 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1127 used for?

Port 1127 is assigned by IANA to kwdb-commn (KWDB Remote Communication).

Is port 1127 TCP or UDP?

Port 1127 is registered for TCP and UDP.

Is it safe to open port 1127?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 1127 is open?

On Linux run "ss -ltnup 'sport = :1127'", on macOS "lsof -nP -i :1127", and on Windows "netstat -ano | findstr :1127" to see the local process. From another machine, "nmap -p 1127 <host>" shows whether it is reachable.

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