Why won't my air hose engage the quick connector on a Fortress compressor?
There are 2 common types of connectors. Unless your female quick disconnect is a universal one, and you will need to get the other type of connector. This is assuming that you are pulling back on the sleeve on the female while pushing the male into the connector.  The automotive type has a wide band close to the end of the male and the standard or generic is a taller narrow bump.