Port 3304

opsession-srvr · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceopsession-srvr

Frequently asked questions

What is port 3304 used for?

Port 3304 is registered with the IANA for opsession-srvr (TCP/UDP). Description: OP Session Server.

Is port 3304 a well-known port?

No. Port 3304 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3304 is open?

Locally on Linux with ss -tulpn | grep ':3304\b', on Windows with netstat -ano | findstr :3304. To test a remote host use Test-NetConnection <host> -Port 3304 in PowerShell or nc -zv <host> 3304 on Linux/macOS.

How do I open port 3304 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3304/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3304/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3304" -Direction Inbound -Protocol TCP -LocalPort 3304 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPopsession-srvrOP Session Server
UDPopsession-srvrOP Session Server

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