Port 681
entrust-aams · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | entrust-aams |
Frequently asked questions
What is port 681 used for?
Port 681 is registered with the IANA for entrust-aams (TCP/UDP). Description: entrust-aams.
Is port 681 a well-known port?
Yes. Port 681 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 681 is open?
Locally on Linux with ss -tulpn | grep ':681\b', on Windows with netstat -ano | findstr :681. To test a remote host use Test-NetConnection <host> -Port 681 in PowerShell or nc -zv <host> 681 on Linux/macOS.
How do I open port 681 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 681/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=681/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 681" -Direction Inbound -Protocol TCP -LocalPort 681 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | entrust-aams | entrust-aams |
| UDP | entrust-aams | entrust-aams |