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// File transfer & sharing

Port 2811: GSI FTP

Port 2811 is assigned by IANA to gsiftp (GSI FTP).

2811

How gsiftp works

File transfer & sharing
client:28111/32/33/3gsiftp client:28111/32/33/3gsiftp

Files are sent over port 2811 in pieces and reassembled on the other side.

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
File transfer & sharing
01 Security

Is port 2811 dangerous?

We have no specific security note for port 2811. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 2811

ServicePortTransportDescriptionReferenceUpdated
gsiftp 2811 TCP, UDP GSI FTP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2811, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2811'      # process listening on 2811
sudo lsof -nP -i :2811

macOS

sudo lsof -nP -i :2811

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2811 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2811
netstat -ano | findstr :2811

From another machine

nmap -p 2811 -sV <host>
sudo nmap -sU -p 2811 <host>
nc -zv <host> 2811

Block it in the firewall

sudo ufw deny 2811/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2811" -Direction Inbound -LocalPort 2811 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2811 used for?

Port 2811 is assigned by IANA to gsiftp (GSI FTP).

Is port 2811 TCP or UDP?

Port 2811 is registered for TCP and UDP.

Is it safe to open port 2811?

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. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 2811 is open?

On Linux run "ss -ltnup 'sport = :2811'", on macOS "lsof -nP -i :2811", and on Windows "netstat -ano | findstr :2811" to see the local process. From another machine, "nmap -p 2811 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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