CyberHunter
Local dataset, no network
// Other services

Port 1241: nessus

Port 1241 is assigned by IANA to nessus (nessus).

1241

How nessus works

Other services
client:1241nessusresponse client:1241nessusresponse

The client sends a request to port 1241 and the nessus 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 1241 dangerous?

We have no specific security note for port 1241. 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 1241

ServicePortTransportDescriptionReferenceUpdated
nessus 1241 TCP, UDP nessus - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1241, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1241'      # process listening on 1241
sudo lsof -nP -i :1241

macOS

sudo lsof -nP -i :1241

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1241 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1241
netstat -ano | findstr :1241

From another machine

nmap -p 1241 -sV <host>
sudo nmap -sU -p 1241 <host>
nc -zv <host> 1241

Block it in the firewall

sudo ufw deny 1241/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1241" -Direction Inbound -LocalPort 1241 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1241 used for?

Port 1241 is assigned by IANA to nessus (nessus).

Is port 1241 TCP or UDP?

Port 1241 is registered for TCP and UDP.

Is it safe to open port 1241?

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 1241 is open?

On Linux run "ss -ltnup 'sport = :1241'", on macOS "lsof -nP -i :1241", and on Windows "netstat -ano | findstr :1241" to see the local process. From another machine, "nmap -p 1241 <host>" shows whether it is reachable.

05 Related
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