Port Checker
Check whether a TCP port is reachable on a public host or domain. UtiliPilot performs the connection test from its server and reports whether the selected port accepts a TCP connection or appears closed, filtered, or unreachable.
How to Use the Port Checker
Enter a host and port to test whether a common network service appears reachable. This is useful for basic connectivity checks when troubleshooting web servers, mail services, databases or remote access.
Practical Example
Checking port 443 for a public website can help indicate whether its HTTPS service is reachable from the checker, while a closed result may point to filtering, service downtime or an incorrect host.
Factors That Affect the Result
Firewalls, NAT, ISP filtering, cloud security groups, service binding, DNS resolution and temporary network issues can all influence the result. A closed port does not always prove that the application itself is broken.
Frequently Asked Questions
What does an open port mean?
It generally means a network service is accepting connections on that port.
Can a firewall make a port look closed?
Yes, filtering can block or drop connection attempts even when a service exists.
Does an open port guarantee the service works correctly?
No, it only indicates connectivity; the application may still have configuration or authentication problems.