Port 4755
gre-udp-dtls · TCP/UDP
| Range | Registered port (1024–49151) |
|---|---|
| Protocol | TCP/UDP |
| Service | gre-udp-dtls |
| Reference | RFC 8086 |
| Registered | 2016-10-05 |
Frequently asked questions
What is port 4755 used for?
Port 4755 is registered with the IANA for gre-udp-dtls (TCP/UDP). Description: Reserved; GRE-in-UDP Encapsulation with DTLS.
Is port 4755 a well-known port?
No. Port 4755 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.
How do I check whether port 4755 is open?
Locally on Linux with ss -tulpn | grep ':4755\b', on Windows with netstat -ano | findstr :4755. To test a remote host use Test-NetConnection <host> -Port 4755 in PowerShell or nc -zv <host> 4755 on Linux/macOS.
How do I open port 4755 in the firewall?
Ubuntu/Debian (ufw): sudo ufw allow 4755/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4755/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4755" -Direction Inbound -Protocol TCP -LocalPort 4755 -Action Allow.
IANA registry entries
| Protocol | Service | Description (IANA) |
|---|---|---|
| TCP | – | Reserved |
| UDP | gre-udp-dtls | GRE-in-UDP Encapsulation with DTLS |