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// Databases & caches

Port 3997: aes_db

Port 3997 is assigned by IANA to agentsease-db (aes_db).

3997

How agentsease-db works

Databases & caches
app:3997agentsease-db app:3997agentsease-db

The application sends a SQL query to the agentsease-db server on port 3997, which returns rows from its tables.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Databases & caches
01 Security

Is port 3997 dangerous?

We have no specific security note for port 3997. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 3997

ServicePortTransportDescriptionReferenceUpdated
agentsease-db 3997 TCP, UDP aes_db - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3997, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3997'      # process listening on 3997
sudo lsof -nP -i :3997

macOS

sudo lsof -nP -i :3997

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3997 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3997
netstat -ano | findstr :3997

From another machine

nmap -p 3997 -sV <host>
sudo nmap -sU -p 3997 <host>
nc -zv <host> 3997

Block it in the firewall

sudo ufw deny 3997/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3997" -Direction Inbound -LocalPort 3997 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3997 used for?

Port 3997 is assigned by IANA to agentsease-db (aes_db).

Is port 3997 TCP or UDP?

Port 3997 is registered for TCP and UDP.

Is it safe to open port 3997?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Bind the service to localhost or a private network, never to a public address.

How do I check if port 3997 is open?

On Linux run "ss -ltnup 'sport = :3997'", on macOS "lsof -nP -i :3997", and on Windows "netstat -ano | findstr :3997" to see the local process. From another machine, "nmap -p 3997 <host>" shows whether it is reachable.

05 Related
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk

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