“The underlying connection was closed: An unexpected error occurred on a send.”
If you receive an error such as this immediately after beginning your Web Store Sync, then you may have an issue with the XML document that is being sent back by the Web Store. There are a few things that could cause this error to occur.
Make sure that your Web Store is sending the proper specifications for the Web Store sync as laid out in the Native Web Store article if you are using the Native template mapping. If you are using one of our supported Web Stores and have mapped it using a default template for that web store, then there may be an issue with your connection to the web store server.
Contact the support team for further assistance.