Port 9901
enrp and enrp-sctp · SCTP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | SCTP/UDP |
| Service | enrp and enrp-sctp |
| Reference | RFC 5353 |
Frequently asked questions
What is port 9901 used for?
Port 9901 is registered with the IANA for enrp and enrp-sctp (SCTP/UDP). Description: enrp server channel.
Is port 9901 a well-known port?
No. Port 9901 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 9901 is open?
Locally on Linux with ss -tulpn | grep ':9901\b', on Windows with netstat -ano | findstr :9901. To test a remote host use Test-NetConnection <host> -Port 9901 in PowerShell or nc -zv <host> 9901 on Linux/macOS.
How do I open port 9901 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 9901/udp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=9901/udp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 9901" -Direction Inbound -Protocol UDP -LocalPort 9901 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| UDP | enrp | enrp server channel |
| SCTP | enrp-sctp | enrp server channel |