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[AspireE2E] aspire run hangs at "Starting dashboard" with AppHost SDK 13.4.x after running aspire CLI 13.5. #18844

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[AspireE2E] aspire run hangs at "Starting dashboard" with AppHost SDK 13.4.x after running aspire CLI 13.5.#18844
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area-clitriage:bot-seenAspire triage bot has seen this issue
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13.5

Description

@Chakolito
Chakolito
opened on Jul 21, 2026

REGRESSION INFO: Works well on a clean aspire cli 13.4.6

INSTALL STEPS

  1. Clean machine: Win11 x64 25h2 ENU.
  2. Install SDK 10.0.302.
  3. Install Aspire 13.5.

REPRO STEPS

  1. Open Command Prompt.
  2. Create an aspire project (no to all prompts)
aspire new aspire-starter -n Aspiretest1 

cd Aspiretest1\Aspiretest1.Apphost
  1. Run the project with aspire run.
  2. Stop the project after dashboard URL appear.
  3. edit Aspiretest1.Apphost.csproj line 1 to:
<Project Sdk="Aspire.AppHost.Sdk/13.4.6">
  1. Clean the project and run again
rmdir /s /q bin obj 2>nul
aspire run --log-level debug

Note

  1. Downgrading aspire CLI to 13.4.6 through aspire update --self and creating a new project retains the issue.
  2. Does not repro when downgrading apphost.sdk lower than 13.4.X.
  3. Also repro when running aspire update to update the project from lower than 13.4.X to 13.4.X.
  4. Also repro on other aspire project templates.

ACTUAL
Command output stops at "Starting dashboard..." and hangs indefinitely.
Image

Expected
Dashboard starts and the CLI reports the Dashboard URL.

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