Error “Unable to parse XML response…”

To troubleshoot the issue, complete any of the following steps as appropriate, in no particular order:

• Confirm that there is not a third-party authentication page that is presented to the users before the Tableau Server sign-in page. You should provide users with a URL that by-passes this sign-in page when they are signing in from Tableau Desktop.
• Confirm that the URL used to connect to Tableau Server works when accessed in a browser.
• If SSL is enabled on the Tableau Server, confirm that you are publishing to the common name on the certificate, and that the server URL protocol shows https://.
• If using a non-standard gateway port to access Tableau Server, try appending the port to the end of the URL when publishing to Tableau Server.
• The characters "<" and ">" are also used by XML tags and will therefore confuse the XML parser. If these characters are used in the title of the dashboard or worksheet, remove them before republishing. 
• Restart Tableau Server. For more information, see tsm restart in Tableau Help.