For painting professional airless painter hose leaking between connecting nut and hose?

Leaks after 10 min of spraying tried new hoses and different system what am I doing wrong only leaks at hose both graco and homelite doing same thing

Leaks after 10 min of spraying tried new hoses and different system what am I doing wrong only leaks at hose both graco and homelite doing same thing

or:Leaks after 10 min of spraying tried new hoses and different system what am I doing wrong only leaks at hose both graco and homelite doing same thing

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