Checklist for Resolving Windows Security 504 Gateway Timeout - Fix Remote Desktop High CPU Usage Caused by Antivirus-Windows RDP Error 0x204 Fix and Solutions
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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