HTTPfy

Port 1822 (es-elmd)

IANA assigns port 1822 to es-elmd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
es-elmd TCP es-elmd David Duncan -
es-elmd UDP es-elmd David Duncan -

Check what is listening on port 1822

Linux: is anything listening on TCP 1822?
sudo ss -tlnp 'sport = :1822'
Linux: UDP 1822
sudo ss -ulnp 'sport = :1822'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1822
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1822 '
Windows (Command Prompt)
netstat -ano | findstr :1822
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1822 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1822
From Windows
Test-NetConnection HOST -Port 1822
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1822

Block port 1822 in the firewall

ufw
sudo ufw deny 1822/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1822 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1822 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1822' -Direction Inbound -Protocol TCP -LocalPort 1822 -Action Block
ufw
sudo ufw deny 1822/udp
iptables
sudo iptables -A INPUT -p udp --dport 1822 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1822 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1822' -Direction Inbound -Protocol UDP -LocalPort 1822 -Action Block

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1820mcagent1821donnyworld1823unisys-lm1824metrics-pas

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