Fix OneDrive Sync Service Unavailable on Windows 10 - How to Fix SSH Connection Refused in PuTTY-Fix Windows Activation Authentication Failed: Invalid Product Key

Updated 2026-06-13 22:02:27office-tools

Fix OneDrive Sync Service Unavailable on Windows 10 - How to Fix SSH Connection Refused in PuTTY-Fix Windows Activation Authentication Failed: Invalid Product Key

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.