Free tool
Open Port Checker for GPS Servers
Use this free port checker to test whether a TCP port on your server is open and reachable from the internet. It is the first check to run when GPS trackers are not reporting to your tracking server.
How to use the port checker
- Enter the server’s domain or public IP address.
- Enter the port your trackers report to, for example 5023.
- Press Check port and read the result and response time.
Port checks: the first step when trackers stop reporting
Every GPS tracker is configured with a server address and a port. If the port is closed by a firewall, blocked by the hosting company, or nothing is listening on it, the device keeps sending and nothing arrives. The tracker’s SMS reply will still say "OK", which is why this problem wastes so much time.
This checker connects to your port from our server on the public internet, exactly like a tracker on a SIM card would. "Open" means the path is clear. "Refused" means the server is reachable but no program is listening on that port. "Timed out" usually means a firewall is silently dropping the traffic.
Further reading: Network ports (Wikipedia)
Need this for your whole fleet?
Run your own GPS server with Fleet Scanner. Our team opens and tests the ports during install. See our self hosted GPS tracking software.
Port Checker FAQs
What does "connection refused" mean?
The server is reachable, but no program is listening on that port. Check that your tracking server is running and configured for that port.
What does "timed out" mean?
Nothing answered within 5 seconds. Usually a firewall, a cloud security group or the hosting provider is blocking the port. Open it for inbound TCP traffic.
Can I check UDP ports?
No, this tool checks TCP, which most GPS trackers use. UDP has no handshake, so an open UDP port cannot be confirmed from outside reliably.
Can I check a server on my local network?
No. For safety, only public internet addresses can be checked. Private ranges such as 192.168.x.x and 10.x.x.x are blocked.