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Port 3997 (agentsease-db)

IANA assigns port 3997 to agentsease-db: aes_db.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
agentsease-db TCP aes_db Colin Hughes -
agentsease-db UDP aes_db Colin Hughes -

Registry dates for this port: registered 2006-02.

Check what is listening on port 3997

Linux: is anything listening on TCP 3997?
sudo ss -tlnp 'sport = :3997'
Linux: UDP 3997
sudo ss -ulnp 'sport = :3997'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3997
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3997 '
Windows (Command Prompt)
netstat -ano | findstr :3997
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3997 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3997
From Windows
Test-NetConnection HOST -Port 3997
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3997

Block port 3997 in the firewall

ufw
sudo ufw deny 3997/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3997 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3997 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3997' -Direction Inbound -Protocol TCP -LocalPort 3997 -Action Block
ufw
sudo ufw deny 3997/udp
iptables
sudo iptables -A INPUT -p udp --dport 3997 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3997 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3997' -Direction Inbound -Protocol UDP -LocalPort 3997 -Action Block

Related ports

3995iss-mgmt-ssl3996abcsoftware3998dnx3999nvcnet

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