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A social media company is migrating its legacy web application to the AWS Cloud. Since the application is complex and may take several months to refactor, the CTO at the company tasked the development team to build an ad-hoc solution of using CloudFront with a custom origin pointing to the SSL endpoint URL for the legacy web application until the replacement is ready and deployed. The ad-hoc solution has worked for several weeks, however, all browser connections recently began showing an HTTP 502 Bad Gateway error with the header "X-Cache: Error from CloudFront". Network monitoring services show that the HTTPS port 443 on the legacy web application is open and responding to requests. As an AWS Certified Solutions Architect Professional, which of the following options will you attribute as the likely cause of the error, and what is your recommendation to resolve this issue?