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// File transfer & sharing

Port 308: Novastor Backup

Port 308 is assigned by IANA to novastorbakcup (Novastor Backup).

308

How novastorbakcup works

File transfer & sharing
client:3081/32/33/3novastorbakcup client:3081/32/33/3novastorbakcup

Files are sent over port 308 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
Well-known (0-1023)
Category
File transfer & sharing
01 Security

Is port 308 dangerous?

We have no specific security note for port 308. 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 308

ServicePortTransportDescriptionReferenceUpdated
novastorbakcup 308 TCP, UDP Novastor Backup - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 308, and is it reachable?

Linux

sudo ss -ltnup 'sport = :308'      # process listening on 308
sudo lsof -nP -i :308

macOS

sudo lsof -nP -i :308

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 308 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 308
netstat -ano | findstr :308

From another machine

nmap -p 308 -sV <host>
sudo nmap -sU -p 308 <host>
nc -zv <host> 308

Block it in the firewall

sudo ufw deny 308/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 308" -Direction Inbound -LocalPort 308 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 308 used for?

Port 308 is assigned by IANA to novastorbakcup (Novastor Backup).

Is port 308 TCP or UDP?

Port 308 is registered for TCP and UDP.

Is it safe to open port 308?

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 308 is open?

On Linux run "ss -ltnup 'sport = :308'", on macOS "lsof -nP -i :308", and on Windows "netstat -ano | findstr :308" to see the local process. From another machine, "nmap -p 308 <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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