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// Other services

Port 1678: prolink

Port 1678 is assigned by IANA to prolink (prolink).

1678

How prolink works

Other services
client:1678prolinkresponse client:1678prolinkresponse

The client sends a request to port 1678 and the prolink 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 1678 dangerous?

We have no specific security note for port 1678. 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 1678

ServicePortTransportDescriptionReferenceUpdated
prolink 1678 TCP, UDP prolink - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1678, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1678'      # process listening on 1678
sudo lsof -nP -i :1678

macOS

sudo lsof -nP -i :1678

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1678 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1678
netstat -ano | findstr :1678

From another machine

nmap -p 1678 -sV <host>
sudo nmap -sU -p 1678 <host>
nc -zv <host> 1678

Block it in the firewall

sudo ufw deny 1678/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1678" -Direction Inbound -LocalPort 1678 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1678 used for?

Port 1678 is assigned by IANA to prolink (prolink).

Is port 1678 TCP or UDP?

Port 1678 is registered for TCP and UDP.

Is it safe to open port 1678?

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 1678 is open?

On Linux run "ss -ltnup 'sport = :1678'", on macOS "lsof -nP -i :1678", and on Windows "netstat -ano | findstr :1678" to see the local process. From another machine, "nmap -p 1678 <host>" shows whether it is reachable.

05 Related
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