I have a production site that worked fine with authorize.net up until about 2:00PM EST today. cURL is throwing back a "SSL peer certificate or SSH remote key was not OK" error when attempting to post data to https://secure.authorize.net/gateway/transact.dll.

I am the only developer on the site, and I have not logged in at all today until someone reported an issue where they could not complete their transaction. Can anyone provide me with any direction? I have tried restarting the entire device just for good measure. No luck.