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// Databases & caches

Port 8997: Oracle Messaging Server Event Notification Service

Port 8997 is assigned by IANA to oracle-ms-ens (Oracle Messaging Server Event Notification Service).

8997

How oracle-ms-ens works

Databases & caches
app:8997oracle-ms-ens app:8997oracle-ms-ens

The application sends a SQL query to the oracle-ms-ens server on port 8997, which returns rows from its tables.

Transport
TCP
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 8997 dangerous?

We have no specific security note for port 8997. 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 8997

ServicePortTransportDescriptionReferenceUpdated
oracle-ms-ens 8997 TCP Oracle Messaging Server Event Notification Service - 2014-10-28
-8997-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8997, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8997'      # process listening on 8997
sudo lsof -nP -i :8997

macOS

sudo lsof -nP -i :8997

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8997 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8997
netstat -ano | findstr :8997

From another machine

nmap -p 8997 -sV <host>
nc -zv <host> 8997

Block it in the firewall

sudo ufw deny 8997/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8997" -Direction Inbound -LocalPort 8997 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8997 used for?

Port 8997 is assigned by IANA to oracle-ms-ens (Oracle Messaging Server Event Notification Service).

Is port 8997 TCP or UDP?

Port 8997 is registered for TCP.

Is it safe to open port 8997?

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 8997 is open?

On Linux run "ss -ltnup 'sport = :8997'", on macOS "lsof -nP -i :8997", and on Windows "netstat -ano | findstr :8997" to see the local process. From another machine, "nmap -p 8997 <host>" shows whether it is reachable.

05 Related
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