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// Other services

Port 4594: IAS-Session (ANRI-ANRI)

Port 4594 is assigned by IANA to ias-session (IAS-Session (ANRI-ANRI)).

4594

How ias-session works

Other services
client:4594ias-sessionresponse client:4594ias-sessionresponse

The client sends a request to port 4594 and the ias-session 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 4594 dangerous?

We have no specific security note for port 4594. 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 4594

ServicePortTransportDescriptionReferenceUpdated
ias-session 4594 TCP, UDP IAS-Session (ANRI-ANRI) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4594, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4594'      # process listening on 4594
sudo lsof -nP -i :4594

macOS

sudo lsof -nP -i :4594

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4594 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4594
netstat -ano | findstr :4594

From another machine

nmap -p 4594 -sV <host>
sudo nmap -sU -p 4594 <host>
nc -zv <host> 4594

Block it in the firewall

sudo ufw deny 4594/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4594" -Direction Inbound -LocalPort 4594 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4594 used for?

Port 4594 is assigned by IANA to ias-session (IAS-Session (ANRI-ANRI)).

Is port 4594 TCP or UDP?

Port 4594 is registered for TCP and UDP.

Is it safe to open port 4594?

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 4594 is open?

On Linux run "ss -ltnup 'sport = :4594'", on macOS "lsof -nP -i :4594", and on Windows "netstat -ano | findstr :4594" to see the local process. From another machine, "nmap -p 4594 <host>" shows whether it is reachable.

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