Troubleshooting VS Code Copilot Docker Test Failure With Network Error

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Docker Test Fails with Network Error in VS Code Copilot

A user has reported a bug where the Copilot extension in VS Code fails when testing a Dockerfile, consistently producing a network error. This issue occurs immediately after Copilot starts Docker, preventing the user from effectively testing their Docker configurations.

Issue Description

When attempting to use Copilot to test a Dockerfile, the process fails quickly with the following error message:

"""text Sorry, your request failed. Please try again. Request id: b254b72e-2f25-4d95-90a1-db17551b6971

Reason: Please check your firewall rules and network connection then try again. Error Code: net::ERR_NETWORK_CHANGED. """

This error suggests a potential network connectivity issue or a problem with firewall rules, but it occurs specifically within the Copilot Docker testing environment.

Environment Details

  • Extension Version: 0.29.1
  • VS Code Version: Code 1.102.2 (c306e94f98122556ca081f527b466015e1bc37b0, 2025-07-22T12:15:48.520Z)
  • OS Version: Linux x64 6.8.0-64-generic
  • System Info:
    • CPUs: AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics (16 x 4077)
    • GPU Status: 2d_canvas enabled, canvas_oop_rasterization enabled_on, direct_rendering_display_compositor disabled_off_ok, gpu_compositing enabled, multiple_raster_threads enabled_on, opengl enabled_on, rasterization enabled, raw_draw disabled_off_ok, skia_graphite disabled_off, video_decode enabled, video_encode disabled_software, vulkan disabled_off, webgl enabled, webgl2 enabled, webgpu disabled_off, webnn disabled_off
    • Load (avg): 2, 2, 2
    • Memory (System): 30.01GB (9.25GB free)
    • Process Argv: /home/daniel/GIT/Hardware/Buderus-KM217-Clone --crash-reporter-id 31ff275e-b8a9-478e-aa2e-f852690536b7
    • Screen Reader: no
    • VM: 0%
    • DESKTOP_SESSION: cinnamon
    • XDG_CURRENT_DESKTOP: X-Cinnamon
    • XDG_SESSION_DESKTOP: cinnamon
    • XDG_SESSION_TYPE: x11
  • A/B Experiments: (List of experiments)
    • vsliv368cf:30146710
    • pythonvspyt551:31249599
    • binariesv615:30325510
    • h48ei257:31000450
    • nativeloc1:31344060
    • dwcopilot:31170013
    • 6074i472:31201624
    • dwoutputs:31242946
    • hdaa2157:31222309
    • copilot_t_ci:31333650
    • e5gg6876:31282496
    • pythoneinst12:31285622
    • c7cif404:31314491
    • pythonpulldiag:31343502
    • 996jf627:31283433
    • pythonrdcb7:31342333
    • usemplatestapi:31297334
    • 0aa6g176:31307128
    • 747dc170:31275177
    • aj953862:31281341
    • generatesymbolt:31295002
    • convertfstringf:31295003
    • pylancequickfixf:31350060
    • 9d2cg352:31346308
    • convertlamdaf:31350062
    • usemarketplace:31343026
    • nesew2to5:31336538
    • agentclaude:31350858
    • nes-diff-11:31337487
    • replacestringexc:31350595
    • nes-set-on:31351930
    • 6abeh943:31336334
    • envsactivate1:31353494
    • yijiwantestdri0626-t:31336930
    • 0927b901:31350571
    • ji9b5146:31348712
    • 45650338:31354155
    • 0cj2b977:31352657

Steps to Reproduce

  1. Open a Dockerfile in VS Code.
  2. Use Copilot to initiate a test of the Dockerfile.
  3. Observe the error message after a short delay.

Possible Causes

Several factors could be contributing to this issue:

  1. Firewall Restrictions: Firewall rules on the user's system might be blocking network connections required by the Docker container or VS Code Copilot.
  2. Network Configuration: Issues with the network configuration, such as DNS resolution or proxy settings, could prevent Copilot from accessing necessary resources.
  3. Docker Configuration: Misconfigured Docker settings, including network configurations or resource limitations, may lead to the failure.
  4. Extension Bug: There might be an underlying bug in the Copilot extension that causes it to mismanage network connections during Docker testing.

Troubleshooting Steps

To address this issue, consider the following troubleshooting steps:

  1. Check Firewall Rules: Ensure that the firewall allows connections for Docker and VS Code Copilot. This may involve adding specific rules to permit traffic on the ports used by Docker.
  2. Verify Network Connection: Confirm that the system has a stable internet connection and can resolve external hostnames. Try pinging external sites to check connectivity.
  3. Review Docker Configuration: Examine the Docker configuration files for any network-related settings that might be causing issues. Look for configurations related to networking, proxies, and DNS.
  4. Update VS Code and Copilot: Ensure that both VS Code and the Copilot extension are updated to the latest versions. Updates often include bug fixes and improvements that could resolve the problem.
  5. Restart VS Code and Docker: Restarting both VS Code and Docker can sometimes clear temporary issues and restore proper functionality.
  6. Check Docker Daemon Logs: Inspect the Docker daemon logs for any error messages or warnings that could provide clues about the failure.
  7. Disable Other Extensions: Try disabling other VS Code extensions to rule out any conflicts with Copilot.

Community Discussion

This issue has been raised in the Microsoft discussion category, indicating that other users may be experiencing similar problems. Community discussions can be a valuable resource for finding solutions or workarounds.

Conclusion

The "net::ERR_NETWORK_CHANGED" error when testing Dockerfiles with VS Code Copilot is a significant issue that disrupts the development workflow. By systematically troubleshooting potential causes such as firewall restrictions, network configurations, Docker settings, and extension bugs, users may be able to resolve this problem. Engaging with community discussions and monitoring updates to VS Code and the Copilot extension can also provide valuable insights and solutions.