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// Other services

Port 5768: OpenMail CMTS Server

Port 5768 is assigned by IANA to openmailpxy (OpenMail CMTS Server).

5768

How openmailpxy works

Other services
client:5768openmailpxyresponse client:5768openmailpxyresponse

The client sends a request to port 5768 and the openmailpxy 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 5768 dangerous?

We have no specific security note for port 5768. 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 5768

ServicePortTransportDescriptionReferenceUpdated
openmailpxy 5768 TCP, UDP OpenMail CMTS Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5768, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5768'      # process listening on 5768
sudo lsof -nP -i :5768

macOS

sudo lsof -nP -i :5768

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5768 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5768
netstat -ano | findstr :5768

From another machine

nmap -p 5768 -sV <host>
sudo nmap -sU -p 5768 <host>
nc -zv <host> 5768

Block it in the firewall

sudo ufw deny 5768/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5768" -Direction Inbound -LocalPort 5768 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5768 used for?

Port 5768 is assigned by IANA to openmailpxy (OpenMail CMTS Server).

Is port 5768 TCP or UDP?

Port 5768 is registered for TCP and UDP.

Is it safe to open port 5768?

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 5768 is open?

On Linux run "ss -ltnup 'sport = :5768'", on macOS "lsof -nP -i :5768", and on Windows "netstat -ano | findstr :5768" to see the local process. From another machine, "nmap -p 5768 <host>" shows whether it is reachable.

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