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// Other services

Port 2561: MosaixCC

Port 2561 is assigned by IANA to mosaixcc (MosaixCC).

2561

How mosaixcc works

Other services
client:2561mosaixccresponse client:2561mosaixccresponse

The client sends a request to port 2561 and the mosaixcc 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 2561 dangerous?

We have no specific security note for port 2561. 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 2561

ServicePortTransportDescriptionReferenceUpdated
mosaixcc 2561 TCP, UDP MosaixCC - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2561, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2561'      # process listening on 2561
sudo lsof -nP -i :2561

macOS

sudo lsof -nP -i :2561

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2561 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2561
netstat -ano | findstr :2561

From another machine

nmap -p 2561 -sV <host>
sudo nmap -sU -p 2561 <host>
nc -zv <host> 2561

Block it in the firewall

sudo ufw deny 2561/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2561" -Direction Inbound -LocalPort 2561 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2561 used for?

Port 2561 is assigned by IANA to mosaixcc (MosaixCC).

Is port 2561 TCP or UDP?

Port 2561 is registered for TCP and UDP.

Is it safe to open port 2561?

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 2561 is open?

On Linux run "ss -ltnup 'sport = :2561'", on macOS "lsof -nP -i :2561", and on Windows "netstat -ano | findstr :2561" to see the local process. From another machine, "nmap -p 2561 <host>" shows whether it is reachable.

05 Related
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