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Port 8405 (svbackup)

IANA assigns port 8405 to svbackup: SuperVault Backup.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
svbackup TCP SuperVault Backup Nine Technology LLC -

Registry dates for this port: registered 2009-09-14, last modified 2011-08-01.

Check what is listening on port 8405

Linux: is anything listening on TCP 8405?
sudo ss -tlnp 'sport = :8405'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8405
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8405 '
Windows (Command Prompt)
netstat -ano | findstr :8405
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8405 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8405
From Windows
Test-NetConnection HOST -Port 8405

Block port 8405 in the firewall

ufw
sudo ufw deny 8405/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8405 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8405 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8405' -Direction Inbound -Protocol TCP -LocalPort 8405 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.