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Port 5771 (netagent)

IANA assigns port 5771 to netagent: NetAgent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netagent TCP NetAgent Bradley Birnbaum -
netagent UDP NetAgent Bradley Birnbaum -

Check what is listening on port 5771

Linux: is anything listening on TCP 5771?
sudo ss -tlnp 'sport = :5771'
Linux: UDP 5771
sudo ss -ulnp 'sport = :5771'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5771
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5771 '
Windows (Command Prompt)
netstat -ano | findstr :5771
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5771 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5771
From Windows
Test-NetConnection HOST -Port 5771
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5771

Block port 5771 in the firewall

ufw
sudo ufw deny 5771/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5771 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5771 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5771' -Direction Inbound -Protocol TCP -LocalPort 5771 -Action Block
ufw
sudo ufw deny 5771/udp
iptables
sudo iptables -A INPUT -p udp --dport 5771 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5771 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5771' -Direction Inbound -Protocol UDP -LocalPort 5771 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.