We put an old window screen across the entry. So far it's deterred all but our favorite chicken, who is bound & determined to follow me anywhere. Gwen is such a sweetie!
I should add that about a month ago I went out on the pack porch to find that my girls had re-discovered the pepper plants I've been babying. They ate 1/2 of the leaves. Between the craptacular weather here in WA state and chickens who keep eating the plants' leaves, it'll be an honest-to-god miracle if I get a single pepper off of the 12 plants. Anyway, when I found the girls nibbling upon the leaves, again, I. FLIPPED. OUT. I yelled, waved my arms like mad, and tossed the chickens one by one into the grass. The RIR took off before I could get her. They haven't come back to the porch.
Except for Gwen. She's figured out how to get around that screen but she does hightail it for the yard when she sees me coming onto the porch. She knows that's no-no land.