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// Other services

Port 40843: CSCCFIREWALL

Port 40843 is assigned by IANA to csccfirewall (CSCCFIREWALL).

40843

How csccfirewall works

Other services
client:40843csccfirewallresponse client:40843csccfirewallresponse

The client sends a request to port 40843 and the csccfirewall 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 40843 dangerous?

We have no specific security note for port 40843. 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 40843

ServicePortTransportDescriptionReferenceUpdated
csccfirewall 40843 TCP, UDP CSCCFIREWALL - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 40843, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40843'      # process listening on 40843
sudo lsof -nP -i :40843

macOS

sudo lsof -nP -i :40843

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40843 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40843
netstat -ano | findstr :40843

From another machine

nmap -p 40843 -sV <host>
sudo nmap -sU -p 40843 <host>
nc -zv <host> 40843

Block it in the firewall

sudo ufw deny 40843/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40843" -Direction Inbound -LocalPort 40843 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 40843 used for?

Port 40843 is assigned by IANA to csccfirewall (CSCCFIREWALL).

Is port 40843 TCP or UDP?

Port 40843 is registered for TCP and UDP.

Is it safe to open port 40843?

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 40843 is open?

On Linux run "ss -ltnup 'sport = :40843'", on macOS "lsof -nP -i :40843", and on Windows "netstat -ano | findstr :40843" to see the local process. From another machine, "nmap -p 40843 <host>" shows whether it is reachable.

05 Related
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