Port 4373

remctl · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceremctl
Registered2007-08-30

Frequently asked questions

What is port 4373 used for?

Port 4373 is registered with the IANA for remctl (TCP/UDP). Description: Remote Authenticated Command Service.

Is port 4373 a well-known port?

No. Port 4373 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4373 is open?

Locally on Linux with ss -tulpn | grep ':4373\b', on Windows with netstat -ano | findstr :4373. To test a remote host use Test-NetConnection <host> -Port 4373 in PowerShell or nc -zv <host> 4373 on Linux/macOS.

How do I open port 4373 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4373/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4373/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4373" -Direction Inbound -Protocol TCP -LocalPort 4373 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPremctlRemote Authenticated Command Service
UDPremctlRemote Authenticated Command Service

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