Port 5757

x500ms · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Servicex500ms

Frequently asked questions

What is port 5757 used for?

Port 5757 is registered with the IANA for x500ms (TCP/UDP). Description: OpenMail X.500 Directory Server.

Is port 5757 a well-known port?

No. Port 5757 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 5757 is open?

Locally on Linux with ss -tulpn | grep ':5757\b', on Windows with netstat -ano | findstr :5757. To test a remote host use Test-NetConnection <host> -Port 5757 in PowerShell or nc -zv <host> 5757 on Linux/macOS.

How do I open port 5757 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 5757/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=5757/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 5757" -Direction Inbound -Protocol TCP -LocalPort 5757 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPx500msOpenMail X.500 Directory Server
UDPx500msOpenMail X.500 Directory Server

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