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// Other services

Port 4064: Ice Firewall Traversal Service (SSL)

Port 4064 is assigned by IANA to ice-srouter (Ice Firewall Traversal Service (SSL)).

4064

How ice-srouter works

Other services
client:4064ice-srouterresponse client:4064ice-srouterresponse

The client sends a request to port 4064 and the ice-srouter 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 4064 dangerous?

We have no specific security note for port 4064. 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 4064

ServicePortTransportDescriptionReferenceUpdated
ice-srouter 4064 TCP, UDP Ice Firewall Traversal Service (SSL) - 2006-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4064, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4064'      # process listening on 4064
sudo lsof -nP -i :4064

macOS

sudo lsof -nP -i :4064

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4064 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4064
netstat -ano | findstr :4064

From another machine

nmap -p 4064 -sV <host>
sudo nmap -sU -p 4064 <host>
nc -zv <host> 4064

Block it in the firewall

sudo ufw deny 4064/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4064" -Direction Inbound -LocalPort 4064 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4064 used for?

Port 4064 is assigned by IANA to ice-srouter (Ice Firewall Traversal Service (SSL)).

Is port 4064 TCP or UDP?

Port 4064 is registered for TCP and UDP.

Is it safe to open port 4064?

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 4064 is open?

On Linux run "ss -ltnup 'sport = :4064'", on macOS "lsof -nP -i :4064", and on Windows "netstat -ano | findstr :4064" to see the local process. From another machine, "nmap -p 4064 <host>" shows whether it is reachable.

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