Port 4451

ctisystemmsg · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicectisystemmsg
Modified2011-10-28

Frequently asked questions

What is port 4451 used for?

Port 4451 is registered with the IANA for ctisystemmsg (TCP/UDP). Description: CTI System Msg.

Is port 4451 a well-known port?

No. Port 4451 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4451 is open?

Locally on Linux with ss -tulpn | grep ':4451\b', on Windows with netstat -ano | findstr :4451. To test a remote host use Test-NetConnection <host> -Port 4451 in PowerShell or nc -zv <host> 4451 on Linux/macOS.

How do I open port 4451 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4451/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4451/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4451" -Direction Inbound -Protocol TCP -LocalPort 4451 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPctisystemmsgCTI System Msg
UDPctisystemmsgCTI System Msg

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