Hi Rishab,
There are mostly three reasons for the error SQLState: 08001 SQL Server Connection failure :
You can check if you have right privilege to connect to the source first.
Thanks
Hi Rishab,
Please check out the below link it will be helpful to you mostly it will be resolved if open your extended dbs such as Postgresql and start the server it will fix.
checkout the below link aswell.
https://forum.mendix.com/link/questions/93267
Please restart your system. That should work.