2 answers
@Yemin Tang
Hi, in this case, review if there is configured a chain certificate in your Tableau Server:
https://help.tableau.com/current/server/en-us/ssl_config.htm
Also, you can check the info here:
https://kb.tableau.com/articles/howto/connecting-tableau-mobile-to-tableau-server-using-ssl
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Diego Martinez
Tableau Visionary and Forums Ambassador