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// Other services

Port 4013: ACL Manager

Port 4013 is assigned by IANA to acl-manager (ACL Manager).

4013

How acl-manager works

Other services
client:4013acl-managerresponse client:4013acl-managerresponse

The client sends a request to port 4013 and the acl-manager 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 4013 dangerous?

We have no specific security note for port 4013. 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 4013

ServicePortTransportDescriptionReferenceUpdated
acl-manager 4013 TCP, UDP ACL Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4013, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4013'      # process listening on 4013
sudo lsof -nP -i :4013

macOS

sudo lsof -nP -i :4013

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4013 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4013
netstat -ano | findstr :4013

From another machine

nmap -p 4013 -sV <host>
sudo nmap -sU -p 4013 <host>
nc -zv <host> 4013

Block it in the firewall

sudo ufw deny 4013/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4013" -Direction Inbound -LocalPort 4013 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4013 used for?

Port 4013 is assigned by IANA to acl-manager (ACL Manager).

Is port 4013 TCP or UDP?

Port 4013 is registered for TCP and UDP.

Is it safe to open port 4013?

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 4013 is open?

On Linux run "ss -ltnup 'sport = :4013'", on macOS "lsof -nP -i :4013", and on Windows "netstat -ano | findstr :4013" to see the local process. From another machine, "nmap -p 4013 <host>" shows whether it is reachable.

05 Related
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