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// Other services

Port 2271: Secure Meeting Maker Scheduling

Port 2271 is assigned by IANA to mmcals (Secure Meeting Maker Scheduling).

2271

How mmcals works

Other services
client:2271mmcalsresponse client:2271mmcalsresponse

The client sends a request to port 2271 and the mmcals 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 2271 dangerous?

We have no specific security note for port 2271. 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 2271

ServicePortTransportDescriptionReferenceUpdated
mmcals 2271 TCP, UDP Secure Meeting Maker Scheduling - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2271, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2271'      # process listening on 2271
sudo lsof -nP -i :2271

macOS

sudo lsof -nP -i :2271

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2271 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2271
netstat -ano | findstr :2271

From another machine

nmap -p 2271 -sV <host>
sudo nmap -sU -p 2271 <host>
nc -zv <host> 2271

Block it in the firewall

sudo ufw deny 2271/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2271" -Direction Inbound -LocalPort 2271 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2271 used for?

Port 2271 is assigned by IANA to mmcals (Secure Meeting Maker Scheduling).

Is port 2271 TCP or UDP?

Port 2271 is registered for TCP and UDP.

Is it safe to open port 2271?

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 2271 is open?

On Linux run "ss -ltnup 'sport = :2271'", on macOS "lsof -nP -i :2271", and on Windows "netstat -ano | findstr :2271" to see the local process. From another machine, "nmap -p 2271 <host>" shows whether it is reachable.

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