The Payment API tests in the admincp only check to see if your server can connect to paypal, and not the other way around. I don't know the details of how the payment system works so I don't know if it always connects the other way (paypal to your server) or what happens if it can't.
It looks to me like the url that paypal should connect to is sent with the initial communication, so that's probably why you never had to set that. The code uses the bburl setting which you've no doubt changed to https already (It's "Forum URL" in the settings"), so I doubt that's it. But there could be other issues with SSL. This is all speculation and I know it doesn't help much.
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