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// File transfer & sharing

Port 5233: Etinnae Network File Service

Port 5233 is assigned by IANA to enfs (Etinnae Network File Service).

5233

How enfs works

File transfer & sharing
client:52331/32/33/3enfs client:52331/32/33/3enfs

Files are sent over port 5233 in pieces and reassembled on the other side.

Transport
TCP
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 5233 dangerous?

We have no specific security note for port 5233. 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 5233

ServicePortTransportDescriptionReferenceUpdated
enfs 5233 TCP Etinnae Network File Service - 2011-03-09
-5233-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5233, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5233'      # process listening on 5233
sudo lsof -nP -i :5233

macOS

sudo lsof -nP -i :5233

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5233 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5233
netstat -ano | findstr :5233

From another machine

nmap -p 5233 -sV <host>
nc -zv <host> 5233

Block it in the firewall

sudo ufw deny 5233/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5233" -Direction Inbound -LocalPort 5233 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5233 used for?

Port 5233 is assigned by IANA to enfs (Etinnae Network File Service).

Is port 5233 TCP or UDP?

Port 5233 is registered for TCP.

Is it safe to open port 5233?

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 5233 is open?

On Linux run "ss -ltnup 'sport = :5233'", on macOS "lsof -nP -i :5233", and on Windows "netstat -ano | findstr :5233" to see the local process. From another machine, "nmap -p 5233 <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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