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// File transfer & sharing

Port 6122: Backup Express Web Server

Port 6122 is assigned by IANA to bex-webadmin (Backup Express Web Server).

6122

How bex-webadmin works

File transfer & sharing
client:61221/32/33/3bex-webadmin client:61221/32/33/3bex-webadmin

Files are sent over port 6122 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 6122 dangerous?

We have no specific security note for port 6122. 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 6122

ServicePortTransportDescriptionReferenceUpdated
bex-webadmin 6122 TCP, UDP Backup Express Web Server - 2015-02-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 6122, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6122'      # process listening on 6122
sudo lsof -nP -i :6122

macOS

sudo lsof -nP -i :6122

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6122 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6122
netstat -ano | findstr :6122

From another machine

nmap -p 6122 -sV <host>
sudo nmap -sU -p 6122 <host>
nc -zv <host> 6122

Block it in the firewall

sudo ufw deny 6122/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6122" -Direction Inbound -LocalPort 6122 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6122 used for?

Port 6122 is assigned by IANA to bex-webadmin (Backup Express Web Server).

Is port 6122 TCP or UDP?

Port 6122 is registered for TCP and UDP.

Is it safe to open port 6122?

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 6122 is open?

On Linux run "ss -ltnup 'sport = :6122'", on macOS "lsof -nP -i :6122", and on Windows "netstat -ano | findstr :6122" to see the local process. From another machine, "nmap -p 6122 <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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