Anybody know if an expired SSL certificate would cause all my commerce categories to 404? I can’t imagine they’d be related, but both started showing up at about the same time today…

Yes there are some nlapiRequestURLs on some versions to categories apis in the server side (depends on version). Those would fail with expired SSLs Try clearing caches.

Yep. Totally what it was. I’m really sick of clients ignoring their hosting/domain/SSL expiration notices…

Make them use automatic NS certs 🙂