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// File transfer & sharing

Port 1120: Battle.net File Transfer Protocol

Port 1120 is assigned by IANA to bnetfile (Battle.net File Transfer Protocol).

1120

How bnetfile works

File transfer & sharing
client:11201/32/33/3bnetfile client:11201/32/33/3bnetfile

Files are sent over port 1120 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 1120 dangerous?

We have no specific security note for port 1120. 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 1120

ServicePortTransportDescriptionReferenceUpdated
bnetfile 1120 TCP, UDP Battle.net File Transfer Protocol - 2005-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 1120, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1120'      # process listening on 1120
sudo lsof -nP -i :1120

macOS

sudo lsof -nP -i :1120

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1120 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1120
netstat -ano | findstr :1120

From another machine

nmap -p 1120 -sV <host>
sudo nmap -sU -p 1120 <host>
nc -zv <host> 1120

Block it in the firewall

sudo ufw deny 1120/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1120" -Direction Inbound -LocalPort 1120 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1120 used for?

Port 1120 is assigned by IANA to bnetfile (Battle.net File Transfer Protocol).

Is port 1120 TCP or UDP?

Port 1120 is registered for TCP and UDP.

Is it safe to open port 1120?

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 1120 is open?

On Linux run "ss -ltnup 'sport = :1120'", on macOS "lsof -nP -i :1120", and on Windows "netstat -ano | findstr :1120" to see the local process. From another machine, "nmap -p 1120 <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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