I have 4 outlets under my back porch. 1 is a Gfci that works , the other 3 do not work at all. As far as I can tell they are connected to that Gfci. I have checked the breaker and the connections in the Gfci. All good . What else could be the problem?

I would check voltage in and out of good GFI, could be a bad connection at the next in line, interupting the rest.
A Possibility that they are on another circuit.
Have you tripped and reset that GFI?

Yes I reset that Gfi. And actually put in a new one. Still no work. I will check the voltage at the next line and let cha know what I come up with. Thanks so much ;)