3.3 Security software / endpoint protection
Renew or replace the certificate. For testing, you can issue a new self-signed certificate and trust it on the client. rdp error code 0x3 extended error code 0x7
Troubleshooting RDP Error 0x3 (Extended Error 0x7) Remote Desktop Protocol (RDP) is essential for modern remote work, but it can be frustrating when a connection fails with a cryptic message like "Error code: 0x3, Extended error code: 0x7." Often, the connection fails during authentication, after the
is more specific, pointing to a problem with the Remote Desktop Session Host (RD Session Host) or the RDP Connection Broker service. Often, the connection fails during authentication, after the RDP handshake has successfully begun. This usually suggests a problem with server-side services, security protocols, or user permissions. Restart the machine to let it reinstall properly
Open Device Manager on the remote machine, find Microsoft Remote Display Adapter under Display Adapters, and Uninstall it. Restart the machine to let it reinstall properly. 2. Check Network and Firewall Rules