See whether the public endpoint accepted a TCP connection.
TCP diagnostic
Can your service port be reached?
Test the endpoint's default service port and see connection reachability and latency with the DNS, TLS, and HTTP context around it.
Free, no login required
Run a TCP reachability check
Use HTTPS to test port 443 or HTTP to test port 80. Custom port sets are planned.
What you get
Separate network reachability from app health.
Review the measured connection timing when the port responds.
Use DNS, TLS, and HTTP evidence to decide whether the problem is deeper than the port.
Can I enter port 8443?
The current instant probe uses the URL's explicit port when supplied, otherwise 443 for HTTPS or 80 for HTTP. Arbitrary port sets and scheduled port profiles are planned.
Does this scan internal services?
No. Local, private, and reserved targets are blocked. Only public endpoints are eligible.