Opens the port and measures the response time.
Ready to run. What comes out here:
A closed port is usually the wrong address, the wrong port, or the proxy being down. An open port with refused credentials is a changed password. An open port with a completed request is an address ready to use — the exit IP confirms the connection leaves from the right place.
Up to ten lines per run, with a few seconds per check. Nothing you paste is kept: the list exists only while the check runs.
Because opening the port is not the same as working. The test shows whether the proxy accepts your credentials and completes a real request.
It comes from this site’s echo. Until the site is published on an address the proxy can reach, the tool shows what it already proved — port, protocol and time — and says the echo was missing.
It does not judge the quality of the address nor guarantee that a specific site will accept it. It answers three things: it opened, it answered, and it left from where.
