I can successfully embed views in the sharepoint portal using the TableauEmbeddedView webpart and trusted authentication between sharepoint server and tableau server. Everything works internally. However, if my external sharepoint users try to access the views inside of the webpart, they will get a "<Browser> can not display the webpage" type of error. (I think) This is because my tableau server is not externally facing, but my sharepoint server is. What is the best way to solve this problem?