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// Other services

Port 312: VSLMP

Port 312 is assigned by IANA to vslmp (VSLMP).

312

How vslmp works

Other services
client:312vslmpresponse client:312vslmpresponse

The client sends a request to port 312 and the vslmp 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 312 dangerous?

We have no specific security note for port 312. 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 312

ServicePortTransportDescriptionReferenceUpdated
vslmp 312 TCP, UDP VSLMP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 312, and is it reachable?

Linux

sudo ss -ltnup 'sport = :312'      # process listening on 312
sudo lsof -nP -i :312

macOS

sudo lsof -nP -i :312

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 312 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 312
netstat -ano | findstr :312

From another machine

nmap -p 312 -sV <host>
sudo nmap -sU -p 312 <host>
nc -zv <host> 312

Block it in the firewall

sudo ufw deny 312/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 312" -Direction Inbound -LocalPort 312 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 312 used for?

Port 312 is assigned by IANA to vslmp (VSLMP).

Is port 312 TCP or UDP?

Port 312 is registered for TCP and UDP.

Is it safe to open port 312?

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 312 is open?

On Linux run "ss -ltnup 'sport = :312'", on macOS "lsof -nP -i :312", and on Windows "netstat -ano | findstr :312" to see the local process. From another machine, "nmap -p 312 <host>" shows whether it is reachable.

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