[VS Code] "Unable to get local issuer certificate" when GitLab On Prem is behind a Proxy

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Slack thread: https://gitlab.slack.com/archives/C053WFAK56U/p1704485892754959

Key points:

  • "Ignore Certificate Errors" inside the GitLab VSCode extension settings did not fix the error

Customer also had an issue with CoPilot along these lines, but was able to resolve them with the following extensions:

  • Node Extra CA Certs VSCode - Visual Studio Marketplace
  • win-ca - Visual Studio Marketplace

Customer was advised to allow-list gitlab.com with zscaler, but customer advised that they do not have the ability to do this.