CyberHunter
Local dataset, no network
// Other services

Port 1391: Storage Access Server

Port 1391 is assigned by IANA to iclpv-sas (Storage Access Server).

1391

How iclpv-sas works

Other services
client:1391iclpv-sasresponse client:1391iclpv-sasresponse

The client sends a request to port 1391 and the iclpv-sas 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 1391 dangerous?

We have no specific security note for port 1391. 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 1391

ServicePortTransportDescriptionReferenceUpdated
iclpv-sas 1391 TCP, UDP Storage Access Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1391, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1391'      # process listening on 1391
sudo lsof -nP -i :1391

macOS

sudo lsof -nP -i :1391

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1391 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1391
netstat -ano | findstr :1391

From another machine

nmap -p 1391 -sV <host>
sudo nmap -sU -p 1391 <host>
nc -zv <host> 1391

Block it in the firewall

sudo ufw deny 1391/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1391" -Direction Inbound -LocalPort 1391 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1391 used for?

Port 1391 is assigned by IANA to iclpv-sas (Storage Access Server).

Is port 1391 TCP or UDP?

Port 1391 is registered for TCP and UDP.

Is it safe to open port 1391?

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 1391 is open?

On Linux run "ss -ltnup 'sport = :1391'", on macOS "lsof -nP -i :1391", and on Windows "netstat -ano | findstr :1391" to see the local process. From another machine, "nmap -p 1391 <host>" shows whether it is reachable.

05 Related
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