We are having all orders fail since around the middle of June 2014. We are using an unofficial payment gateway plugin for Chase Paymentech. I'm not seeing why it has suddenly stopped working and no one is aware of any changes made on the site or in CartThrob. Is this possibly related to the 'heartbleed' updates that everyone was doing for SSL certificates?
In mid-June 2014 Chase Orbital changed how to connect to their payment gateway. Basically you will need a "host" parameter in the header of your xml connection document. I've updated our version of the php gateway file in CartThrob for Chase Orbital Paymentech so that it's now working. Hopefully the changes can be integrated into future versions of CartThrob but I'm not sure how to contact the developer(s), or if they already have the needed information.