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// Other services

Port 11723: EMC XtremSW distributed cache

Port 11723 is assigned by IANA to emc-xsw-dcache (EMC XtremSW distributed cache).

11723

How emc-xsw-dcache works

Other services
client:11723emc-xsw-dcacheresponse client:11723emc-xsw-dcacheresponse

The client sends a request to port 11723 and the emc-xsw-dcache 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 11723 dangerous?

We have no specific security note for port 11723. 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 11723

ServicePortTransportDescriptionReferenceUpdated
emc-xsw-dcache 11723 TCP, UDP EMC XtremSW distributed cache - 2013-09-18

// source: IANA service name and port number registry

03 Check it

Which program uses port 11723, and is it reachable?

Linux

sudo ss -ltnup 'sport = :11723'      # process listening on 11723
sudo lsof -nP -i :11723

macOS

sudo lsof -nP -i :11723

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 11723 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 11723
netstat -ano | findstr :11723

From another machine

nmap -p 11723 -sV <host>
sudo nmap -sU -p 11723 <host>
nc -zv <host> 11723

Block it in the firewall

sudo ufw deny 11723/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 11723" -Direction Inbound -LocalPort 11723 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 11723 used for?

Port 11723 is assigned by IANA to emc-xsw-dcache (EMC XtremSW distributed cache).

Is port 11723 TCP or UDP?

Port 11723 is registered for TCP and UDP.

Is it safe to open port 11723?

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 11723 is open?

On Linux run "ss -ltnup 'sport = :11723'", on macOS "lsof -nP -i :11723", and on Windows "netstat -ano | findstr :11723" to see the local process. From another machine, "nmap -p 11723 <host>" shows whether it is reachable.

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