Port 442 (cvc-hostd, cvc_hostd)

IANA assigns port 442 to cvc-hostd, cvc_hostd: cvc_hostd IANA assigned this well-formed service name as a replacement for "cvc_hostd"..

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

IANA assignment

Service nameProtoDescriptionAssigneeReference

cvc-hostd TCP cvc_hostd IANA assigned this well-formed service name as a replacement for "cvc_hostd". Bill Davidson -

cvc_hostd TCP cvc_hostd
This entry is an alias to "cvc-hostd". This entry is now historic, not usable for use with many common service discovery mechanisms. Bill Davidson -

cvc-hostd UDP cvc_hostd IANA assigned this well-formed service name as a replacement for "cvc_hostd". Bill Davidson -

cvc_hostd UDP cvc_hostd
This entry is an alias to "cvc-hostd". This entry is now historic, not usable for use with many common service discovery mechanisms. Bill Davidson -

Check what is listening on port 442

Linux: is anything listening on TCP 442?

sudo ss -tlnp 'sport = :442'

Linux: UDP 442

sudo ss -ulnp 'sport = :442'

Linux / macOS: which process owns the port

sudo lsof -nP -i :442

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':442 '

Windows (Command Prompt)

netstat -ano | findstr :442

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 442 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 442

From Windows

Test-NetConnection HOST -Port 442

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 442

Block port 442 in the firewall

ufw

sudo ufw deny 442/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 442 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 442 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 442' -Direction Inbound -Protocol TCP -LocalPort 442 -Action Block

ufw

sudo ufw deny 442/udp