Manyam,
You probably have a https URL for connecting to Polarion web services? If so, you will need to get the certificate authority file from the Polarion site and import it in Project → Settings in Mendix Studio Pro.
To retrieve the certificate file on a Chrome browser, I went to the URL for a normal Polarion login, clicked on the SSL-lock on the URL bar, then clicked on the Show Certificate menu and copied it to a .crt or .cer file from the Details tab.
Import this .crt or .cer file in Mendix Studio Pro by double clicking on the Settings menu under your Project , click on the Certificates tab and then on Import. Build your project again locally and hopefully this time you will be able to login successfully.
More information at this link https://docs.mendix.com/refguide/project-settings#5-certificates-tab
It works!. Many thanks.