I get errors while installing or updating a plugin from an update site

• Unable to read repository at … sun.security.validator.ValidatorException: PKIX path building failed

• SSL Handshake: invalid SSL session

Most probable causes for the above errors are:

• Outdated certificate authority truststore in the Java Runtime Environment (JRE). In this case the easiest fix is to download a newer DVT distro containing an up to date JRE.

• Proxy or firewall filtering / altering secure connections. In this case you can ask your CAD/IT team if any filtering is taking place or you can try to download a zipped update site and install the plugin from that archive.