Test Connection from Sharepoint Administration Page Failed in Confluence
SharePoint Connector for Confluence
As of August 22, 2016 ownership of the SharePoint Connector transferred from Atlassian to Communardo Software GmbH. Future feature development and support will be done by Communardo. As an Atlassian Platinum Expert, Communardo is a specialist in Atlassian products and a Microsoft Gold Certified Partner with a specialization in Microsoft SharePoint.
Head to the SharePoint Connector Knowledge Base for more info.