Port 2738

ndl-tcp-ois-gw · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicendl-tcp-ois-gw

Frequently asked questions

What is port 2738 used for?

Port 2738 is registered with the IANA for ndl-tcp-ois-gw (TCP/UDP). Description: NDL TCP-OSI Gateway.

Is port 2738 a well-known port?

No. Port 2738 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 2738 is open?

Locally on Linux with ss -tulpn | grep ':2738\b', on Windows with netstat -ano | findstr :2738. To test a remote host use Test-NetConnection <host> -Port 2738 in PowerShell or nc -zv <host> 2738 on Linux/macOS.

How do I open port 2738 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 2738/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=2738/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 2738" -Direction Inbound -Protocol TCP -LocalPort 2738 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPndl-tcp-ois-gwNDL TCP-OSI Gateway
UDPndl-tcp-ois-gwNDL TCP-OSI Gateway

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