Port 2721

smart-diagnose · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicesmart-diagnose

Frequently asked questions

What is port 2721 used for?

Port 2721 is registered with the IANA for smart-diagnose (TCP/UDP). Description: Smart Diagnose.

Is port 2721 a well-known port?

No. Port 2721 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 2721 is open?

Locally on Linux with ss -tulpn | grep ':2721\b', on Windows with netstat -ano | findstr :2721. To test a remote host use Test-NetConnection <host> -Port 2721 in PowerShell or nc -zv <host> 2721 on Linux/macOS.

How do I open port 2721 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 2721/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=2721/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 2721" -Direction Inbound -Protocol TCP -LocalPort 2721 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPsmart-diagnoseSmart Diagnose
UDPsmart-diagnoseSmart Diagnose

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