Always Could not connect to remote server message

Dear author of this package,

I am trying to use this package.
I uploaded the file remote_query_server.php to the remote server.
I also hardcoded in that file the settings for the database connection.
I insert a query in the $sql variable to test by accessing it through the remote server url.

It worked and echo to the browser the data from database.

On my local server i added the other 2 files example.php and remotequery.class.php.
I didn't set any variables as i said them on the remote file.
I removed also the securitykey in both server files.

I entered the url for the remote server and the path of the remote server file.

And after the execution i get Could not connect to remote server.

Can you send me a step by step tutorial how to implement this?

I can't get it to work.

Thanks in advance