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Port 5781 (3par-evts)

IANA assigns port 5781 to 3par-evts: 3PAR Event Reporting Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
3par-evts TCP 3PAR Event Reporting Service Sushil Thomas -
3par-evts UDP 3PAR Event Reporting Service Sushil Thomas -

Registry dates for this port: registered 2008-03-10.

Check what is listening on port 5781

Linux: is anything listening on TCP 5781?
sudo ss -tlnp 'sport = :5781'
Linux: UDP 5781
sudo ss -ulnp 'sport = :5781'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5781
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5781 '
Windows (Command Prompt)
netstat -ano | findstr :5781
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5781 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5781
From Windows
Test-NetConnection HOST -Port 5781
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5781

Block port 5781 in the firewall

ufw
sudo ufw deny 5781/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5781 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5781 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5781' -Direction Inbound -Protocol TCP -LocalPort 5781 -Action Block
ufw
sudo ufw deny 5781/udp
iptables
sudo iptables -A INPUT -p udp --dport 5781 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5781 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5781' -Direction Inbound -Protocol UDP -LocalPort 5781 -Action Block

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