First configure ssl in tableau server configuration page. go to config window and select ssl page and drag your certificate and configure.
thank you for your answer. But I'm not sure, but let me tell you more.
servername is tableau-server1.smith-company.de. The communication goes through http://tableau-server1 to log on.
We have a Wildcard-certificate named *.smith.de.
For externea Access we want to use https://tableau.smith.de
Does this work, or does we get a certificate error?