The most frequent culprit is a stalled Remote Desktop Connection Broker service ( tssdis ).
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Network Level Authentication (NLA) is a critical security feature that authenticates users before a full RDP session is established. It relies on the Credential Security Support Provider (CredSSP) protocol. Mismatches between client and server updates or Group Policy settings are a major source of RDP errors. rdp error code 0x3 extended error code 0x7
Decoding RDP Error Code 0x3 (Extended Error Code 0x7): Causes and Fixes
Quick targeted fixes (based on likely cause) The most frequent culprit is a stalled Remote
(tssdis.exe) fails to restart after an update, leaving the server "blind" to incoming requests. He checked the logs: Service Status : He confirmed the Remote Desktop Services were running. Policy Check
If your Event Viewer logs show Event ID 1296 ("Connection Broker is not ready for RPC communication") or Event ID 1306 ("Redirection failed"), your broker is failing to handle traffic over hardened encryption standards. If you share with third parties, their policies apply
Navigate to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment . Set Use hardware graphics adapter for all Remote Desktop Services Sessions to Enabled .
Navigate to: Computer Configuration > Administrative Templates > System > Device Installation > Device Installation Restrictions .