How can I get my 5 year old dog to stop peeing in house -even with doggie door?

my j.r.t. is five years old and there are about 5 spots throughout the house that he pees on if given the chance I tried to put up a gate and keep him out of the "main part of the house,he is allowed in the pantry and the pantry connects to my bedroom where he sleeps,along with my other two dogs who can't jump the gate.They all have access to the dog door in the pantry,sir pee alot has not been fixed yet, I get really mad when I see he got me again.