HTTPfy

Port 3061 (cautcpd)

IANA assigns port 3061 to cautcpd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cautcpd TCP cautcpd - -
cautcpd UDP cautcpd - -

Check what is listening on port 3061

Linux: is anything listening on TCP 3061?
sudo ss -tlnp 'sport = :3061'
Linux: UDP 3061
sudo ss -ulnp 'sport = :3061'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3061
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3061 '
Windows (Command Prompt)
netstat -ano | findstr :3061
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3061 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3061
From Windows
Test-NetConnection HOST -Port 3061
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3061

Block port 3061 in the firewall

ufw
sudo ufw deny 3061/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3061 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3061 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3061' -Direction Inbound -Protocol TCP -LocalPort 3061 -Action Block
ufw
sudo ufw deny 3061/udp
iptables
sudo iptables -A INPUT -p udp --dport 3061 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3061 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3061' -Direction Inbound -Protocol UDP -LocalPort 3061 -Action Block

Related ports

3059qsoft3060interserver3062ncacn-ip-tcp3063ncadg-ip-udp

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