There's a notification in SC

"Seller Central was down from 11:20 to 11:38 PST today. We have corrected this issue, and sellers are now able to access Seller Central. We apologize for any inconvenience."

I didn't notice it down, though.

The homepage loads, but I can't get any search results on amazon canada.

Seller Central was down for a few minutes - looks like it is back up now...