I had this issue, was caused by using a different php installation to the one I thought I was using. Check your path, and make sure the php you are calling is the same as the one running in your webserver. turned out I was using one installed in windows itself, and the one I was expecting was a wamp installation which was configured to use mysql. the windows one wasnt.

The machine actively refusing it can also be interpreted as "the machine ignored you because it doesnt have the service you are looking for"

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