HTTPfy

Port 3977 (opswmanager)

IANA assigns port 3977 to opswmanager: Opsware Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opswmanager TCP Opsware Manager Dave Jagoda -
opswmanager UDP Opsware Manager Dave Jagoda -

Registry dates for this port: registered 2006-06.

Check what is listening on port 3977

Linux: is anything listening on TCP 3977?
sudo ss -tlnp 'sport = :3977'
Linux: UDP 3977
sudo ss -ulnp 'sport = :3977'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3977
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3977 '
Windows (Command Prompt)
netstat -ano | findstr :3977
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3977 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3977
From Windows
Test-NetConnection HOST -Port 3977
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3977

Block port 3977 in the firewall

ufw
sudo ufw deny 3977/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3977 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3977 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3977' -Direction Inbound -Protocol TCP -LocalPort 3977 -Action Block
ufw
sudo ufw deny 3977/udp
iptables
sudo iptables -A INPUT -p udp --dport 3977 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3977 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3977' -Direction Inbound -Protocol UDP -LocalPort 3977 -Action Block

Related ports

3975airshot3976opswagent3978secure-cfg-svr3979smwan

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