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Local dataset, no network
// Databases & caches

Port 5155: Oracle asControl Agent

Port 5155 is assigned by IANA to asctrl-agent (Oracle asControl Agent).

5155

How asctrl-agent works

Databases & caches
app:5155asctrl-agent app:5155asctrl-agent

The application sends a SQL query to the asctrl-agent server on port 5155, 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 5155 dangerous?

We have no specific security note for port 5155. 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 5155

ServicePortTransportDescriptionReferenceUpdated
asctrl-agent 5155 TCP, UDP Oracle asControl Agent - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5155, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5155'      # process listening on 5155
sudo lsof -nP -i :5155

macOS

sudo lsof -nP -i :5155

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5155 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5155
netstat -ano | findstr :5155

From another machine

nmap -p 5155 -sV <host>
sudo nmap -sU -p 5155 <host>
nc -zv <host> 5155

Block it in the firewall

sudo ufw deny 5155/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5155" -Direction Inbound -LocalPort 5155 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5155 used for?

Port 5155 is assigned by IANA to asctrl-agent (Oracle asControl Agent).

Is port 5155 TCP or UDP?

Port 5155 is registered for TCP and UDP.

Is it safe to open port 5155?

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 5155 is open?

On Linux run "ss -ltnup 'sport = :5155'", on macOS "lsof -nP -i :5155", and on Windows "netstat -ano | findstr :5155" to see the local process. From another machine, "nmap -p 5155 <host>" shows whether it is reachable.

05 Related
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