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// File transfer & sharing

Port 2257: simple text/file transfer

Port 2257 is assigned by IANA to simple-tx-rx (simple text/file transfer).

2257

How simple-tx-rx works

File transfer & sharing
client:22571/32/33/3simple-tx-rx client:22571/32/33/3simple-tx-rx

Files are sent over port 2257 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 2257 dangerous?

We have no specific security note for port 2257. 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 2257

ServicePortTransportDescriptionReferenceUpdated
simple-tx-rx 2257 TCP, UDP simple text/file transfer - 2006-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 2257, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2257'      # process listening on 2257
sudo lsof -nP -i :2257

macOS

sudo lsof -nP -i :2257

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2257 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2257
netstat -ano | findstr :2257

From another machine

nmap -p 2257 -sV <host>
sudo nmap -sU -p 2257 <host>
nc -zv <host> 2257

Block it in the firewall

sudo ufw deny 2257/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2257" -Direction Inbound -LocalPort 2257 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2257 used for?

Port 2257 is assigned by IANA to simple-tx-rx (simple text/file transfer).

Is port 2257 TCP or UDP?

Port 2257 is registered for TCP and UDP.

Is it safe to open port 2257?

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 2257 is open?

On Linux run "ss -ltnup 'sport = :2257'", on macOS "lsof -nP -i :2257", and on Windows "netstat -ano | findstr :2257" to see the local process. From another machine, "nmap -p 2257 <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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