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// Other services

Port 2605: NSC POSA

Port 2605 is assigned by IANA to nsc-posa (NSC POSA).

2605

How nsc-posa works

Other services
client:2605nsc-posaresponse client:2605nsc-posaresponse

The client sends a request to port 2605 and the nsc-posa 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 2605 dangerous?

We have no specific security note for port 2605. 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 2605

ServicePortTransportDescriptionReferenceUpdated
nsc-posa 2605 TCP, UDP NSC POSA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2605, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2605'      # process listening on 2605
sudo lsof -nP -i :2605

macOS

sudo lsof -nP -i :2605

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2605 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2605
netstat -ano | findstr :2605

From another machine

nmap -p 2605 -sV <host>
sudo nmap -sU -p 2605 <host>
nc -zv <host> 2605

Block it in the firewall

sudo ufw deny 2605/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2605" -Direction Inbound -LocalPort 2605 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2605 used for?

Port 2605 is assigned by IANA to nsc-posa (NSC POSA).

Is port 2605 TCP or UDP?

Port 2605 is registered for TCP and UDP.

Is it safe to open port 2605?

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 2605 is open?

On Linux run "ss -ltnup 'sport = :2605'", on macOS "lsof -nP -i :2605", and on Windows "netstat -ano | findstr :2605" to see the local process. From another machine, "nmap -p 2605 <host>" shows whether it is reachable.

05 Related
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