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// File transfer & sharing

Port 44445: Acronis Backup Gateway service port

Port 44445 is assigned by IANA to acronis-backup (Acronis Backup Gateway service port).

44445

How acronis-backup works

File transfer & sharing
client:444451/32/33/3acronis-backup client:444451/32/33/3acronis-backup

Files are sent over port 44445 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 44445 dangerous?

We have no specific security note for port 44445. 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 44445

ServicePortTransportDescriptionReferenceUpdated
acronis-backup 44445 TCP Acronis Backup Gateway service port - 2019-11-25
-44445-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 44445, and is it reachable?

Linux

sudo ss -ltnup 'sport = :44445'      # process listening on 44445
sudo lsof -nP -i :44445

macOS

sudo lsof -nP -i :44445

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 44445 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 44445
netstat -ano | findstr :44445

From another machine

nmap -p 44445 -sV <host>
nc -zv <host> 44445

Block it in the firewall

sudo ufw deny 44445/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 44445" -Direction Inbound -LocalPort 44445 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 44445 used for?

Port 44445 is assigned by IANA to acronis-backup (Acronis Backup Gateway service port).

Is port 44445 TCP or UDP?

Port 44445 is registered for TCP.

Is it safe to open port 44445?

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 44445 is open?

On Linux run "ss -ltnup 'sport = :44445'", on macOS "lsof -nP -i :44445", and on Windows "netstat -ano | findstr :44445" to see the local process. From another machine, "nmap -p 44445 <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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