How do I fix this leaking dishwasher drain pipe?
I would start by cleaning up the corrosion and debris. If possible remove the hose/boot and clean any debris from the inside sealing surface. Inspect the hose for any cracks or holes. Looking at the photo the bottom clamp appears to be installed correctly. The upper hose appears to be installed too low. The clamp is squeezing the hose but not the pipe. The clamp should be against the shoulder/flange of the hose.