Ncat: Connection refused.

This error message indicates that Ncat (a command-line tool used for network connection) attempted to establish a connection to a remote host, but the remote host refused the connection request.

There are various reasons why a remote host might refuse a connection request. Some possible causes include:

- The remote host is not running the service that Ncat is trying to connect to.
- The remote host is configured to block incoming connections from the IP address that Ncat is using.
- The remote host is experiencing network connectivity issues or is down.

To troubleshoot this error, you can try the following:

- Check that the remote host is running the service that Ncat is trying to connect to.
- Verify that the remote host is not blocking incoming connections from your IP address.
- Try connecting to a different remote host to see if the error persists.
- Check network connectivity between your system and the remote host.