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i've tried telling him no in all kinds of ways
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What do you mean by this? If you have used any punitive or harsh methods, you are making the problem worse.
With cats, this is NOT a housetraining problem. When cats go outside the box, there is always a reason and we have to find out what it is.
You say he's doing this "all of a sudden". This often indicates a physical problem. The first thing to do is have him checked for a urinary tract problem - very common in male cats.
Are both cats spayed and neutered?
How many litterboxes do you have?
If he checks out fine at the vet, I'll have suggestions for you.