Port 429 (ocs-amu, ocs_amu)

IANA assigns port 429 to ocs-amu, ocs_amu: OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu"..

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

IANA assignment

Service nameProtoDescriptionAssigneeReference

ocs-amu TCP OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu". Florence Wyman -

ocs_amu TCP OCS_AMU
This entry is an alias to "ocs-amu". This entry is now historic, not usable for use with many common service discovery mechanisms. Florence Wyman -

ocs-amu UDP OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu". Florence Wyman -

ocs_amu UDP OCS_AMU
This entry is an alias to "ocs-amu". This entry is now historic, not usable for use with many common service discovery mechanisms. Florence Wyman -

Check what is listening on port 429

Linux: is anything listening on TCP 429?

sudo ss -tlnp 'sport = :429'

Linux: UDP 429

sudo ss -ulnp 'sport = :429'

Linux / macOS: which process owns the port

sudo lsof -nP -i :429

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':429 '

Windows (Command Prompt)

netstat -ano | findstr :429

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 429 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 429

From Windows

Test-NetConnection HOST -Port 429

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

nc -vzu -w 5 HOST 429

Block port 429 in the firewall

ufw

sudo ufw deny 429/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 429 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 429 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 429' -Direction Inbound -Protocol TCP -LocalPort 429 -Action Block

ufw

sudo ufw deny 429/udp