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Local dataset, no network
// File transfer & sharing

Port 2774: RBackup Remote Backup

Port 2774 is assigned by IANA to rbakcup2 (RBackup Remote Backup).

2774

How rbakcup2 works

File transfer & sharing
client:27741/32/33/3rbakcup2 client:27741/32/33/3rbakcup2

Files are sent over port 2774 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 2774 dangerous?

We have no specific security note for port 2774. 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 2774

ServicePortTransportDescriptionReferenceUpdated
rbakcup2 2774 TCP, UDP RBackup Remote Backup - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2774, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2774'      # process listening on 2774
sudo lsof -nP -i :2774

macOS

sudo lsof -nP -i :2774

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2774 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2774
netstat -ano | findstr :2774

From another machine

nmap -p 2774 -sV <host>
sudo nmap -sU -p 2774 <host>
nc -zv <host> 2774

Block it in the firewall

sudo ufw deny 2774/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2774" -Direction Inbound -LocalPort 2774 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2774 used for?

Port 2774 is assigned by IANA to rbakcup2 (RBackup Remote Backup).

Is port 2774 TCP or UDP?

Port 2774 is registered for TCP and UDP.

Is it safe to open port 2774?

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 2774 is open?

On Linux run "ss -ltnup 'sport = :2774'", on macOS "lsof -nP -i :2774", and on Windows "netstat -ano | findstr :2774" to see the local process. From another machine, "nmap -p 2774 <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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