javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target.
Once we import the below 3 certificates manually to the keystore the issue is resolved and the studio opens up.
The certificates used by the Talend Servers are trusted by java by default. What JDK version are you using? Are you using a SSL forward proxy (ZScaler , ...etc)?
To check what is happening, please have a look at this article about: