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// Other services

Port 5767: OpenMail Suer Agent Layer (Secure)

Port 5767 is assigned by IANA to s-openmail (OpenMail Suer Agent Layer (Secure)).

5767

How s-openmail works

Other services
client:5767s-openmailresponse client:5767s-openmailresponse

The client sends a request to port 5767 and the s-openmail 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 5767 dangerous?

We have no specific security note for port 5767. 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 5767

ServicePortTransportDescriptionReferenceUpdated
s-openmail 5767 TCP, UDP OpenMail Suer Agent Layer (Secure) - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5767, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5767'      # process listening on 5767
sudo lsof -nP -i :5767

macOS

sudo lsof -nP -i :5767

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5767 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5767
netstat -ano | findstr :5767

From another machine

nmap -p 5767 -sV <host>
sudo nmap -sU -p 5767 <host>
nc -zv <host> 5767

Block it in the firewall

sudo ufw deny 5767/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5767" -Direction Inbound -LocalPort 5767 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5767 used for?

Port 5767 is assigned by IANA to s-openmail (OpenMail Suer Agent Layer (Secure)).

Is port 5767 TCP or UDP?

Port 5767 is registered for TCP and UDP.

Is it safe to open port 5767?

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 5767 is open?

On Linux run "ss -ltnup 'sport = :5767'", on macOS "lsof -nP -i :5767", and on Windows "netstat -ano | findstr :5767" to see the local process. From another machine, "nmap -p 5767 <host>" shows whether it is reachable.

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