Port 4137

cl-db-remote · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicecl-db-remote
Registered2007-01

Frequently asked questions

What is port 4137 used for?

Port 4137 is registered with the IANA for cl-db-remote (TCP/UDP). Description: Classic Line Database Server Remote.

Is port 4137 a well-known port?

No. Port 4137 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4137 is open?

Locally on Linux with ss -tulpn | grep ':4137\b', on Windows with netstat -ano | findstr :4137. To test a remote host use Test-NetConnection <host> -Port 4137 in PowerShell or nc -zv <host> 4137 on Linux/macOS.

How do I open port 4137 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4137/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4137/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4137" -Direction Inbound -Protocol TCP -LocalPort 4137 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPcl-db-remoteClassic Line Database Server Remote
UDPcl-db-remoteClassic Line Database Server Remote

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