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Port 497 (retrospect)

IANA assigns port 497 to retrospect: Retrospect backup and restore service.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
retrospect TCP Retrospect backup and restore service Retrospect Inc -
retrospect UDP Retrospect backup and restore service Retrospect Inc -

Registry dates for this port: last modified 2012-02-02.

Check what is listening on port 497

Linux: is anything listening on TCP 497?
sudo ss -tlnp 'sport = :497'
Linux: UDP 497
sudo ss -ulnp 'sport = :497'
Linux / macOS: which process owns the port
sudo lsof -nP -i :497
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':497 '
Windows (Command Prompt)
netstat -ano | findstr :497
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 497 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 497
From Windows
Test-NetConnection HOST -Port 497
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 497

Block port 497 in the firewall

ufw
sudo ufw deny 497/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 497 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 497 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 497' -Direction Inbound -Protocol TCP -LocalPort 497 -Action Block
ufw
sudo ufw deny 497/udp
iptables
sudo iptables -A INPUT -p udp --dport 497 -j DROP
nftables
sudo nft add rule inet filter input udp dport 497 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 497' -Direction Inbound -Protocol UDP -LocalPort 497 -Action Block

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