Port 591

http-alt · TCP/UDP

RangeSystem/well-known port (0–1023)
ProtocolTCP/UDP
Servicehttp-alt

Frequently asked questions

What is port 591 used for?

Port 591 is registered with the IANA for http-alt (TCP/UDP). Description: FileMaker, Inc. - HTTP Alternate (see Port 80).

Is port 591 a well-known port?

Yes. Port 591 is in the range 0–1023 (system or well-known ports). On Linux and macOS only privileged processes may bind to these ports.

How do I check whether port 591 is open?

Locally on Linux with ss -tulpn | grep ':591\b', on Windows with netstat -ano | findstr :591. To test a remote host use Test-NetConnection <host> -Port 591 in PowerShell or nc -zv <host> 591 on Linux/macOS.

How do I open port 591 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 591/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=591/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 591" -Direction Inbound -Protocol TCP -LocalPort 591 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPhttp-altFileMaker, Inc. - HTTP Alternate (see Port 80)
UDPhttp-altFileMaker, Inc. - HTTP Alternate (see Port 80)

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