HTTPfy

Port 3978 (secure-cfg-svr)

IANA assigns port 3978 to secure-cfg-svr: Secured Configuration Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
secure-cfg-svr TCP Secured Configuration Server Dr Anupam Bharali -
secure-cfg-svr UDP Secured Configuration Server Dr Anupam Bharali -

Registry dates for this port: registered 2006-06.

Check what is listening on port 3978

Linux: is anything listening on TCP 3978?
sudo ss -tlnp 'sport = :3978'
Linux: UDP 3978
sudo ss -ulnp 'sport = :3978'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3978
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3978 '
Windows (Command Prompt)
netstat -ano | findstr :3978
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3978 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3978
From Windows
Test-NetConnection HOST -Port 3978
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3978

Block port 3978 in the firewall

ufw
sudo ufw deny 3978/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3978 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3978 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3978' -Direction Inbound -Protocol TCP -LocalPort 3978 -Action Block
ufw
sudo ufw deny 3978/udp
iptables
sudo iptables -A INPUT -p udp --dport 3978 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3978 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3978' -Direction Inbound -Protocol UDP -LocalPort 3978 -Action Block

Related ports

3976opswagent3977opswmanager3979smwan3981starfish

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