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Cannot modify data source after changing hostname


I have deployed Yellowfin BI in an Amazon server and made a data source pointing to an AWS rdbms (postgres). Now the database server moved to another host, the previous server has been shutdown.

My problem is I cannot change configuration of the old data source to point to new server, it shows me a timed-out message after a few minutes loading.

"502 Bad Gateway
The gateway received an invalid HTTP response or unexpected disconnect from the original server"

I have also made a new data source pointing to new host, but I cannot modify the old views, it said "connection timed-out".

Could you please help to tell me how I apply the new hostname to the old data source?

Thank you,

Manh Le.