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Fix Chrome ERR_TUNNEL_CONNECTION_FAILED Proxy Error - Firefox Not Responding After Update: How to Fix-Configuring Windows Update in an Ubuntu VM

Updated 2026-06-13 15:37:02cloud-software
Fix Chrome ERR_TUNNEL_CONNECTION_FAILED Proxy Error - Firefox Not Responding After Update: How to Fix-Configuring Windows Update in an Ubuntu VM
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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