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// Other services

Port 5249: CA AC Lang Service

Port 5249 is assigned by IANA to caaclang2 (CA AC Lang Service).

5249

How caaclang2 works

Other services
client:5249caaclang2response client:5249caaclang2response

The client sends a request to port 5249 and the caaclang2 service answers.

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
Other services
01 Security

Is port 5249 dangerous?

We have no specific security note for port 5249. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 5249

ServicePortTransportDescriptionReferenceUpdated
caaclang2 5249 TCP, UDP CA AC Lang Service - 2008-02-19

// source: IANA service name and port number registry

03 Check it

Which program uses port 5249, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5249'      # process listening on 5249
sudo lsof -nP -i :5249

macOS

sudo lsof -nP -i :5249

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5249 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5249
netstat -ano | findstr :5249

From another machine

nmap -p 5249 -sV <host>
sudo nmap -sU -p 5249 <host>
nc -zv <host> 5249

Block it in the firewall

sudo ufw deny 5249/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5249" -Direction Inbound -LocalPort 5249 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5249 used for?

Port 5249 is assigned by IANA to caaclang2 (CA AC Lang Service).

Is port 5249 TCP or UDP?

Port 5249 is registered for TCP and UDP.

Is it safe to open port 5249?

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. Close the port if nothing on the host needs it.

How do I check if port 5249 is open?

On Linux run "ss -ltnup 'sport = :5249'", on macOS "lsof -nP -i :5249", and on Windows "netstat -ano | findstr :5249" to see the local process. From another machine, "nmap -p 5249 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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