docs: self-signed certificate / internal CA handling for GitHub Enterprise - #1050
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…Hub Enterprise Adds an advanced-usage section explaining the 'self signed certificate in certificate chain' error seen on GitHub Enterprise Server and behind TLS-inspecting proxies. Recommends the secure fix of trusting the internal CA via NODE_EXTRA_CA_CERTS (or the OS trust store on self-hosted runners), with a GitHub Enterprise callout, and warns against disabling TLS verification since the JDK download has no checksum fallback. Refs #640 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
Adds documentation to help GitHub Enterprise Server (GHES) and corporate-proxy users resolve self signed certificate in certificate chain errors safely when actions/setup-java downloads JDK metadata/archives, steering users toward trusting the internal CA instead of disabling TLS verification.
Changes:
- Adds a new “Self-signed certificates and internal CAs (GitHub Enterprise)” section explaining cause, secure remediation, and security implications.
- Adds two workflow YAML examples showing how to provide an internal CA bundle via NODE_EXTRA_CA_CERTS.
- Adds a matching table-of-contents entry.
| File | Description |
|---|---|
| docs/advanced-usage.md | Adds GHES/internal-CA guidance and examples for resolving self-signed certificate chain errors securely. |
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| - name: Trust the internal CA | ||
| run: echo "NODE_EXTRA_CA_CERTS=/etc/ssl/certs/internal-ca.pem" >> "$GITHUB_ENV" | ||
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| - uses: actions/setup-java@v5 | ||
| with: |
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| - name: Write and trust the internal CA | ||
| run: | | ||
| echo "${{ secrets.INTERNAL_CA_PEM }}" > "${RUNNER_TEMP}/internal-ca.pem" | ||
| echo "NODE_EXTRA_CA_CERTS=${RUNNER_TEMP}/internal-ca.pem" >> "$GITHUB_ENV" | ||
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| - uses: actions/setup-java@v5 |
This was referenced Jun 23, 2026
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Bumps the github-actions group with 4 updates: [actions/setup-python](https://github.com/actions/setup-python), [actions/setup-java](https://github.com/actions/setup-java), [anthropics/claude-code-action](https://github.com/anthropics/claude-code-action) and [actions/setup-dotnet](https://github.com/actions/setup-dotnet). Updates `actions/setup-python` from 6.2.0 to 6.3.0 Release notes *Sourced from [actions/setup-python's releases](https://github.com/actions/setup-python/releases).* > v6.3.0 > ------ > > What's Changed > -------------- > > ### Enhancement > > * Add RHEL support and include Linux distro in cache keys by [`@priyagupta108`](https://github.com/priyagupta108) in [actions/setup-python#1323](https://redirect.github.com/actions/setup-python/pull/1323) > * Fix pip cache error handling on Windows by [`@priyagupta108`](https://github.com/priyagupta108) in [actions/setup-python#1040](https://redirect.github.com/actions/setup-python/pull/1040) > > ### Dependency update > > * Upgrade minimatch from 3.1.2 to 3.1.5 by [`@dependabot`](https://github.com/dependabot) in [actions/setup-python#1281](https://redirect.github.com/actions/setup-python/pull/1281) > * Upgrade actions dependencies by [`@gowridurgad`](https://github.com/gowridurgad) with [`@Copilot`](https://github.com/Copilot) in [actions/setup-python#1303](https://redirect.github.com/actions/setup-python/pull/1303) > * Upgrade `@actions/cache` to 5.1.0, log cache write denied by [`@jasongin`](https://github.com/jasongin) in [actions/setup-python#1324](https://redirect.github.com/actions/setup-python/pull/1324) > * Upgrade dependency versions and test workflow configuration by [`@HarithaVattikuti`](https://github.com/HarithaVattikuti) in [actions/setup-python#1322](https://redirect.github.com/actions/setup-python/pull/1322) > > ### Documentation > > * Update advanced-usage.md by [`@Dunky-Z`](https://github.com/Dunky-Z) in [actions/setup-python#811](https://redirect.github.com/actions/setup-python/pull/811) > > New Contributors > ---------------- > > * [`@gowridurgad`](https://github.com/gowridurgad) with [`@Copilot`](https://github.com/Copilot) made their first contribution in [actions/setup-python#1303](https://redirect.github.com/actions/setup-python/pull/1303) > * [`@jasongin`](https://github.com/jasongin) made their first contribution in [actions/setup-python#1324](https://redirect.github.com/actions/setup-python/pull/1324) > * [`@Dunky-Z`](https://github.com/Dunky-Z) made their first contribution in [actions/setup-python#811](https://redirect.github.com/actions/setup-python/pull/811) > > **Full Changelog**: <actions/setup-python@v6...v6.3.0> Commits * [`ece7cb0`](actions/setup-python@ece7cb0) Fix pip cache error handling on Windows. ([#1040](https://redirect.github.com/actions/setup-python/issues/1040)) * [`1d18d7a`](actions/setup-python@1d18d7a) Update advanced-usage.md ([#811](https://redirect.github.com/actions/setup-python/issues/811)) * [`d2b357a`](actions/setup-python@d2b357a) Update dependency versions and test workflow configuration ([#1322](https://redirect.github.com/actions/setup-python/issues/1322)) * [`8f639b1`](actions/setup-python@8f639b1) Merge pull request [#1324](https://redirect.github.com/actions/setup-python/issues/1324) from jasongin/update-actions-cache-5.1.0 * [`6731c2b`](actions/setup-python@6731c2b) Resolve high-severity audit issues * [`0cb1a84`](actions/setup-python@0cb1a84) Add RHEL support and include Linux distro in cache keys ([#1323](https://redirect.github.com/actions/setup-python/issues/1323)) * [`dc6eab6`](actions/setup-python@dc6eab6) Update dist * [`6f4b74b`](actions/setup-python@6f4b74b) Strict equality * [`fa8bde1`](actions/setup-python@fa8bde1) Bump `@actions/cache` to 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handling for GitHub Ente... * [`5431e71`](actions/setup-java@5431e71) docs: add JavaFX Maven project configuration instructions ([#1044](https://redirect.github.com/actions/setup-java/issues/1044)) * [`4baa9b4`](actions/setup-java@4baa9b4) docs: replace non-existent HelloWorldApp references with java --version ([#1043](https://redirect.github.com/actions/setup-java/issues/1043)) * [`eab4b08`](actions/setup-java@eab4b08) Bump `@types/node` from 25.9.3 to 26.0.0 ([#1031](https://redirect.github.com/actions/setup-java/issues/1031)) * [`bf0c0e6`](actions/setup-java@bf0c0e6) Bump actions/checkout from 6 to 7 ([#1032](https://redirect.github.com/actions/setup-java/issues/1032)) * Additional commits viewable in [compare view](actions/setup-java@ad2b381...1bcf9fb) Updates `anthropics/claude-code-action` from 1.0.153 to 1.0.159 Release notes *Sourced from [anthropics/claude-code-action's releases](https://github.com/anthropics/claude-code-action/releases).* > v1.0.159 > -------- > > What's Changed > -------------- > > * fix: bound app token revocation cleanup by [`@tarunag10`](https://github.com/tarunag10) in [anthropics/claude-code-action#1437](https://redirect.github.com/anthropics/claude-code-action/pull/1437) > > New Contributors > ---------------- > > * [`@tarunag10`](https://github.com/tarunag10) made their first contribution in [anthropics/claude-code-action#1437](https://redirect.github.com/anthropics/claude-code-action/pull/1437) > > **Full Changelog**: <anthropics/claude-code-action@v1...v1.0.159> > > v1.0.158 > -------- > > **Full Changelog**: <anthropics/claude-code-action@v1...v1.0.158> > > v1.0.157 > -------- > > **Full Changelog**: <anthropics/claude-code-action@v1...v1.0.157> > > v1.0.156 > -------- > > **Full Changelog**: <anthropics/claude-code-action@v1...v1.0.156> > > v1.0.155 > -------- > > What's Changed > -------------- > > * fix: filter PR reviews and inline review comments to trigger time by 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view](anthropics/claude-code-action@2fee155...a92e7c7) Updates `actions/setup-dotnet` from 5.3.0 to 5.4.0 Release notes *Sourced from [actions/setup-dotnet's releases](https://github.com/actions/setup-dotnet/releases).* > v5.4.0 > ------ > > What's Changed > -------------- > > ### Enhancements > > * Improve global.json SDK version validation for rollForward by [`@priyagupta108`](https://github.com/priyagupta108) in [actions/setup-dotnet#742](https://redirect.github.com/actions/setup-dotnet/pull/742) > * Pin actions to commit SHAs in workflows by [`@priya-kinthali`](https://github.com/priya-kinthali) in [actions/setup-dotnet#744](https://redirect.github.com/actions/setup-dotnet/pull/744) > * Expand the CSC problem matcher to light up more errors on GitHub. by [`@StephenCleary`](https://github.com/StephenCleary) in [actions/setup-dotnet#717](https://redirect.github.com/actions/setup-dotnet/pull/717) > > ### Documentation > > * Docs(action): Explicitly mark all optional inputs with 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([#717](https://redirect.github.com/actions/setup-dotnet/issues/717)) * [`da5e548`](actions/setup-dotnet@da5e548) docs(action): explicitly mark all optional inputs with required: false ([#737](https://redirect.github.com/actions/setup-dotnet/issues/737)) * [`9bd3b44`](actions/setup-dotnet@9bd3b44) Improve readability of global.json creation command ([#694](https://redirect.github.com/actions/setup-dotnet/issues/694)) * [`4406a63`](actions/setup-dotnet@4406a63) Bump `@actions/cache` to 5.1.0, log cache write denied ([#746](https://redirect.github.com/actions/setup-dotnet/issues/746)) * [`dc3262d`](actions/setup-dotnet@dc3262d) pin actions to commit SHAs in workflows ([#744](https://redirect.github.com/actions/setup-dotnet/issues/744)) * [`95a3f8b`](actions/setup-dotnet@95a3f8b) Validate global.json SDK version before rollForward optimization ([#742](https://redirect.github.com/actions/setup-dotnet/issues/742)) * See full diff in [compare view](actions/setup-dotnet@9a946fd...26b0ec1) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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What
Adds a new "Self-signed certificates and internal CAs (GitHub Enterprise)" section to docs/advanced-usage.md.
Why
Users on GitHub Enterprise Server, or behind a TLS-inspecting corporate proxy, hit Error: self signed certificate in certificate chain when setup-java downloads JDK metadata and archives. There was no documentation explaining the cause or the secure way to resolve it, which leads people toward unsafe workarounds like disabling TLS verification.
What the new section covers
Also adds a matching table-of-contents entry.
Notes
Refs #640