CyberHunter
Local dataset, no network
// Other services

Port 5723: Operations Manager - Health Service

Port 5723 is assigned by IANA to omhs (Operations Manager - Health Service).

5723

How omhs works

Other services
client:5723omhsresponse client:5723omhsresponse

The client sends a request to port 5723 and the omhs 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 5723 dangerous?

We have no specific security note for port 5723. 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 5723

ServicePortTransportDescriptionReferenceUpdated
omhs 5723 TCP, UDP Operations Manager - Health Service - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5723, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5723'      # process listening on 5723
sudo lsof -nP -i :5723

macOS

sudo lsof -nP -i :5723

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5723 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5723
netstat -ano | findstr :5723

From another machine

nmap -p 5723 -sV <host>
sudo nmap -sU -p 5723 <host>
nc -zv <host> 5723

Block it in the firewall

sudo ufw deny 5723/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5723" -Direction Inbound -LocalPort 5723 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5723 used for?

Port 5723 is assigned by IANA to omhs (Operations Manager - Health Service).

Is port 5723 TCP or UDP?

Port 5723 is registered for TCP and UDP.

Is it safe to open port 5723?

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 5723 is open?

On Linux run "ss -ltnup 'sport = :5723'", on macOS "lsof -nP -i :5723", and on Windows "netstat -ano | findstr :5723" to see the local process. From another machine, "nmap -p 5723 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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