HTTPfy

Port 441 (decvms-sysmgt)

IANA assigns port 441 to decvms-sysmgt.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
decvms-sysmgt TCP decvms-sysmgt Lee Barton -
decvms-sysmgt UDP decvms-sysmgt Lee Barton -

Check what is listening on port 441

Linux: is anything listening on TCP 441?
sudo ss -tlnp 'sport = :441'
Linux: UDP 441
sudo ss -ulnp 'sport = :441'
Linux / macOS: which process owns the port
sudo lsof -nP -i :441
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':441 '
Windows (Command Prompt)
netstat -ano | findstr :441
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 441 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 441
From Windows
Test-NetConnection HOST -Port 441
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 441

Block port 441 in the firewall

ufw
sudo ufw deny 441/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 441 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 441 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 441' -Direction Inbound -Protocol TCP -LocalPort 441 -Action Block
ufw
sudo ufw deny 441/udp
iptables
sudo iptables -A INPUT -p udp --dport 441 -j DROP
nftables
sudo nft add rule inet filter input udp dport 441 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 441' -Direction Inbound -Protocol UDP -LocalPort 441 -Action Block

Related ports

439dasp440sgcp442cvc-hostd, cvc_hostd443HTTPS

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