CyberHunter
Local dataset, no network
// Other services

Port 4453: NSS Alert Manager

Port 4453 is assigned by IANA to nssalertmgr (NSS Alert Manager).

4453

How nssalertmgr works

Other services
client:4453nssalertmgrresponse client:4453nssalertmgrresponse

The client sends a request to port 4453 and the nssalertmgr 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 4453 dangerous?

We have no specific security note for port 4453. 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 4453

ServicePortTransportDescriptionReferenceUpdated
nssalertmgr 4453 TCP, UDP NSS Alert Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4453, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4453'      # process listening on 4453
sudo lsof -nP -i :4453

macOS

sudo lsof -nP -i :4453

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4453 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4453
netstat -ano | findstr :4453

From another machine

nmap -p 4453 -sV <host>
sudo nmap -sU -p 4453 <host>
nc -zv <host> 4453

Block it in the firewall

sudo ufw deny 4453/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4453" -Direction Inbound -LocalPort 4453 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4453 used for?

Port 4453 is assigned by IANA to nssalertmgr (NSS Alert Manager).

Is port 4453 TCP or UDP?

Port 4453 is registered for TCP and UDP.

Is it safe to open port 4453?

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 4453 is open?

On Linux run "ss -ltnup 'sport = :4453'", on macOS "lsof -nP -i :4453", and on Windows "netstat -ano | findstr :4453" to see the local process. From another machine, "nmap -p 4453 <host>" shows whether it is reachable.

05 Related
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