Fixing ERR_SSL_PROTOCOL_ERROR Certificate Issues - Cloudflare 521 Error Fix: Origin Server Unreachable-How to Fix Windows Update 504 Gateway Timeout in Windows 10
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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