Port 642
esro-emsdp · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | esro-emsdp |
Frequently asked questions
What is port 642 used for?
Port 642 is registered with the IANA for esro-emsdp (TCP/UDP). Description: ESRO-EMSDP V1.3.
Is port 642 a well-known port?
Yes. Port 642 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 642 is open?
Locally on Linux with ss -tulpn | grep ':642\b', on Windows with netstat -ano | findstr :642. To test a remote host use Test-NetConnection <host> -Port 642 in PowerShell or nc -zv <host> 642 on Linux/macOS.
How do I open port 642 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 642/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=642/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 642" -Direction Inbound -Protocol TCP -LocalPort 642 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | esro-emsdp | ESRO-EMSDP V1.3 |
| UDP | esro-emsdp | ESRO-EMSDP V1.3 |