Postgres not working in directquery mode in service

Hi,

We have a directsquery report with source as Postgres hosted on AWS RDS. We have no issues in Power BI desktop, but when published to service, we are getting 'remote certificate invalid' error.  We tried everything based on the below link, 

https://community.powerbi.com/t5/Desktop/The-remote-certificate-is-invalid-according-to-the-validation/td-p/531475

but with no luck.