We're trying to call a web service that is hosted on the farm, but it keeps returning a 401 Unauthorized. We're able to do a GET REST call without issue. However, even a basic POST call within a workflow returns a 401 Unauthorized. This only occurs when attempting to do it within a workflow. When the service is called through AJAX on a page in SharePoint, it executes fine.
Has anyone run into this issue and knows of a possible solution?