I am getting the connection timeout error. I have tried the hack with no success. I have tried a fresh install of canadapost.php, a fresh install of the entire mod, and a fresh install of the mod on a fresh install of ZC 1.5.4. Nothing works. Is anyone else having similar problems with Canada Post now?

I used this mod for 6 or 7 years without a problem. Indeed, the CP module with dimensional shipping was the reason why I switched to ZC from another ecommerce package way back when. Implementing zone and table rates would be cumbersome and inaccurate, so I hope that Canada Post hasn't created a permanent problem.