Port 517
talk · TCP/UDP
| Range | System/well-known port (0–1023) |
|---|---|
| Protocol | TCP/UDP |
| Service | talk |
Frequently asked questions
What is port 517 used for?
Port 517 is registered with the IANA for talk (TCP/UDP). Description: like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established).
Is port 517 a well-known port?
Yes. Port 517 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 517 is open?
Locally on Linux with ss -tulpn | grep ':517\b', on Windows with netstat -ano | findstr :517. To test a remote host use Test-NetConnection <host> -Port 517 in PowerShell or nc -zv <host> 517 on Linux/macOS.
How do I open port 517 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 517/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=517/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 517" -Direction Inbound -Protocol TCP -LocalPort 517 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | talk | like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established) |
| UDP | talk | like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established) |