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I get an error "Port is already in use", why?

You might get this error:

Error: Port XX is already in use

This error will occur if there is already a process that is listening on the port you have tried to use. The fix is to locate the process using the port and shut it down, then you can run our utility to get 100% access to the port.

Or you can choose to select a different port to listen on.
FAQ image for Port Listener

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Added: Jun 7, 2005   |   Last Updated: Apr 7, 2025