Port 3785

bfd-echo · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicebfd-echo
ReferenceRFC 5881

Frequently asked questions

What is port 3785 used for?

Port 3785 is registered with the IANA for bfd-echo (TCP/UDP). Description: BFD Echo Protocol.

Is port 3785 a well-known port?

No. Port 3785 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 3785 is open?

Locally on Linux with ss -tulpn | grep ':3785\b', on Windows with netstat -ano | findstr :3785. To test a remote host use Test-NetConnection <host> -Port 3785 in PowerShell or nc -zv <host> 3785 on Linux/macOS.

How do I open port 3785 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 3785/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=3785/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 3785" -Direction Inbound -Protocol TCP -LocalPort 3785 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPbfd-echoBFD Echo Protocol
UDPbfd-echoBFD Echo Protocol

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