Port 6551

sum · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicesum
Registered2007-12-13

Frequently asked questions

What is port 6551 used for?

Port 6551 is registered with the IANA for sum (TCP/UDP). Description: Software Update Manager.

Is port 6551 a well-known port?

No. Port 6551 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 6551 is open?

Locally on Linux with ss -tulpn | grep ':6551\b', on Windows with netstat -ano | findstr :6551. To test a remote host use Test-NetConnection <host> -Port 6551 in PowerShell or nc -zv <host> 6551 on Linux/macOS.

How do I open port 6551 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 6551/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=6551/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 6551" -Direction Inbound -Protocol TCP -LocalPort 6551 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPsumSoftware Update Manager
UDPsumSoftware Update Manager

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