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Port 3776 (dvcprov-port)

IANA assigns port 3776 to dvcprov-port: Device Provisioning Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dvcprov-port TCP Device Provisioning Port Rob Lehew -
dvcprov-port UDP Device Provisioning Port Rob Lehew -

Registry dates for this port: registered 2003-06.

Check what is listening on port 3776

Linux: is anything listening on TCP 3776?
sudo ss -tlnp 'sport = :3776'
Linux: UDP 3776
sudo ss -ulnp 'sport = :3776'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3776
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3776 '
Windows (Command Prompt)
netstat -ano | findstr :3776
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3776 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3776
From Windows
Test-NetConnection HOST -Port 3776
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3776

Block port 3776 in the firewall

ufw
sudo ufw deny 3776/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3776 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3776 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3776' -Direction Inbound -Protocol TCP -LocalPort 3776 -Action Block
ufw
sudo ufw deny 3776/udp
iptables
sudo iptables -A INPUT -p udp --dport 3776 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3776 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3776' -Direction Inbound -Protocol UDP -LocalPort 3776 -Action Block

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