CyberHunter
Local dataset, no network
// Other services

Port 40842: CSCCREDIR

Port 40842 is assigned by IANA to csccredir (CSCCREDIR).

40842

How csccredir works

Other services
client:40842csccredirresponse client:40842csccredirresponse

The client sends a request to port 40842 and the csccredir 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 40842 dangerous?

We have no specific security note for port 40842. 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 40842

ServicePortTransportDescriptionReferenceUpdated
csccredir 40842 TCP, UDP CSCCREDIR - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 40842, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40842'      # process listening on 40842
sudo lsof -nP -i :40842

macOS

sudo lsof -nP -i :40842

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40842 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40842
netstat -ano | findstr :40842

From another machine

nmap -p 40842 -sV <host>
sudo nmap -sU -p 40842 <host>
nc -zv <host> 40842

Block it in the firewall

sudo ufw deny 40842/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40842" -Direction Inbound -LocalPort 40842 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 40842 used for?

Port 40842 is assigned by IANA to csccredir (CSCCREDIR).

Is port 40842 TCP or UDP?

Port 40842 is registered for TCP and UDP.

Is it safe to open port 40842?

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 40842 is open?

On Linux run "ss -ltnup 'sport = :40842'", on macOS "lsof -nP -i :40842", and on Windows "netstat -ano | findstr :40842" to see the local process. From another machine, "nmap -p 40842 <host>" shows whether it is reachable.

05 Related
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