Error resolving plugin [id: 'org.jetbrains.intellij', version: '0.3.1']

[nalbion]

$ ./gradlew runIde 
Download https://plugins.gradle.org/m2/org/jetbrains/intellij/org.jetbrains.intellij.gradle.plugin/0.3.1/org.jetbrains.intellij.gradle.plugin-0.3.1.pom

FAILURE: Build failed with an exception.

* Where:
Build file 'build.gradle.kts' line: 0

* What went wrong:
Error resolving plugin [id: 'org.jetbrains.intellij', version: '0.3.1']
> Could not resolve all dependencies for configuration 'detachedConfiguration1'.
   > Could not determine artifacts for org.jetbrains.intellij:org.jetbrains.intellij.gradle.plugin:0.3.1
      > Could not get resource 'https://plugins.gradle.org/m2/org/jetbrains/intellij/org.jetbrains.intellij.gradle.plugin/0.3.1/org.jetbrains.intellij.gradle.plugin-0.3.1.jar'.
         > Could not HEAD 'https://plugins.gradle.org/m2/org/jetbrains/intellij/org.jetbrains.intellij.gradle.plugin/0.3.1/org.jetbrains.intellij.gradle.plugin-0.3.1.jar'.
            > sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

I've got a dodgy ZScaler proxy here, but something else that confuses me is that when I open https://plugins.gradle.org/m2/org/jetbrains/intellij/org.jetbrains.intellij.gradle.plugin/0.3.1 in Chrome I can only see pom.xml but no jar. I can download the pom.xml, but when I try to download the invisible jar, I get redirected to jfrog which doesn't know anything about this jar either.

https://repo.jfrog.org/artifactory/libs-release-bintray/org/jetbrains/intellij/org.jetbrains.intellij.gradle.plugin/0.3.1/org.jetbrains.intellij.gradle.plugin-0.3.1.jar?referrer

[nalbion]

never mind. fixed at proxy