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// Other services

Port 1191: General Parallel File System

Port 1191 is assigned by IANA to gpfs (General Parallel File System).

1191

How gpfs works

Other services
client:1191gpfsresponse client:1191gpfsresponse

The client sends a request to port 1191 and the gpfs 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 1191 dangerous?

We have no specific security note for port 1191. 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 1191

ServicePortTransportDescriptionReferenceUpdated
gpfs 1191 TCP, UDP General Parallel File System - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 1191, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1191'      # process listening on 1191
sudo lsof -nP -i :1191

macOS

sudo lsof -nP -i :1191

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1191 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1191
netstat -ano | findstr :1191

From another machine

nmap -p 1191 -sV <host>
sudo nmap -sU -p 1191 <host>
nc -zv <host> 1191

Block it in the firewall

sudo ufw deny 1191/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1191" -Direction Inbound -LocalPort 1191 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1191 used for?

Port 1191 is assigned by IANA to gpfs (General Parallel File System).

Is port 1191 TCP or UDP?

Port 1191 is registered for TCP and UDP.

Is it safe to open port 1191?

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 1191 is open?

On Linux run "ss -ltnup 'sport = :1191'", on macOS "lsof -nP -i :1191", and on Windows "netstat -ano | findstr :1191" to see the local process. From another machine, "nmap -p 1191 <host>" shows whether it is reachable.

05 Related
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