HTTPfy

Port 3443 (ov-nnm-websrv)

IANA assigns port 3443 to ov-nnm-websrv: OpenView Network Node Manager WEB Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ov-nnm-websrv TCP OpenView Network Node Manager WEB Server Anthony Walker -
ov-nnm-websrv UDP OpenView Network Node Manager WEB Server Anthony Walker -

Registry dates for this port: registered 2002-03.

Check what is listening on port 3443

Linux: is anything listening on TCP 3443?
sudo ss -tlnp 'sport = :3443'
Linux: UDP 3443
sudo ss -ulnp 'sport = :3443'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3443
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3443 '
Windows (Command Prompt)
netstat -ano | findstr :3443
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3443 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3443
From Windows
Test-NetConnection HOST -Port 3443
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3443

Block port 3443 in the firewall

ufw
sudo ufw deny 3443/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3443 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3443' -Direction Inbound -Protocol TCP -LocalPort 3443 -Action Block
ufw
sudo ufw deny 3443/udp
iptables
sudo iptables -A INPUT -p udp --dport 3443 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3443' -Direction Inbound -Protocol UDP -LocalPort 3443 -Action Block

Related ports

3441connect-client3442connect-server3444denali-server3445monp

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