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Port 2804 (dvr-esm)

IANA assigns port 2804 to dvr-esm: March Networks Digital Video Recorders and Enterprise Service Manager products.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dvr-esm TCP March Networks Digital Video Recorders and Enterprise Service Manager products Paul Streatch -
dvr-esm UDP March Networks Digital Video Recorders and Enterprise Service Manager products Paul Streatch -

Registry dates for this port: registered 2004-06.

Check what is listening on port 2804

Linux: is anything listening on TCP 2804?
sudo ss -tlnp 'sport = :2804'
Linux: UDP 2804
sudo ss -ulnp 'sport = :2804'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2804
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2804 '
Windows (Command Prompt)
netstat -ano | findstr :2804
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2804 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2804
From Windows
Test-NetConnection HOST -Port 2804
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2804

Block port 2804 in the firewall

ufw
sudo ufw deny 2804/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2804 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2804 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2804' -Direction Inbound -Protocol TCP -LocalPort 2804 -Action Block
ufw
sudo ufw deny 2804/udp
iptables
sudo iptables -A INPUT -p udp --dport 2804 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2804 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2804' -Direction Inbound -Protocol UDP -LocalPort 2804 -Action Block

Related ports

2802veritas-tcp1, veritas-udp12803btprjctrl2805wta-wsp-s2806cspuni

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