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[docs] Add troubleshooting note for DevTunnel URL publication fix - #1570

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[docs] Add troubleshooting note for DevTunnel URL publication fix#1570
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Documents changes from microsoft/aspire#19590

@karolz-ms

Targeting release/13.6 based on the source PR milestone 13.6.

Why

microsoft/aspire#19590 fixes a regression where DevTunnel port resources could reach Running/Healthy in the dashboard while never publishing their public tunnel URL. The proxyless endpoint allocator (introduced in #17924) was assigning a temporary localhost port to DevTunnel endpoints, which the DevTunnel integration mistakenly treated as a signal that the real endpoint had already been published. The fix limits automatic proxyless port allocation to IComputeResource instances and containers, leaving integration-owned endpoints (like DevTunnel ports) unallocated until the integration publishes the real endpoint.

The dev tunnels docs already state that "tunnel URLs are shown in the Aspire dashboard," so this is a bug_fix_restores_documented_behavior case — the regression was a discrepancy from documented behavior, not a new feature. Since users hit this specific issue on 13.5, I added a short troubleshooting entry so anyone still on 13.5 (or debugging the symptom) can find the explanation and the fix version.

Changes

  • src/frontend/src/content/docs/integrations/devtools/dev-tunnels.mdx: added a new "Dashboard doesn't show a tunnel URL" troubleshooting subsection explaining the 13.5 regression and the 13.6 fix.

No new pages were created; only the existing Troubleshooting section was extended.

Generated by PR Documentation Check for #19590 · auto · 44.1 AIC · ⌖ 7.25 AIC · ⊞ 19.6K ·

@aspire-repo-bot aspire-repo-bot Bot added the docs-from-code Copilot initiated issue from dotnet/aspire repo label Aug 24, 2026
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Frontend HTML artifact ready

The latest frontend build uploaded the frontend-dist artifact for PR #1570. Use the VS Code button below to open this PR with GitHub Artifacts Explorer and browse the built HTML locally.

VS Code: Open PR #1570 artifacts

This comment updates automatically when a new frontend build artifact is uploaded.

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