: Because 5.5.1 is an older release, it may lack support for modern RDP features (like NLA or certain Gateway configurations) found in current Windows environments. If you encounter "Protocol Error" messages, you may need to update the client or adjust the security settings on the destination server.

: Enter the Host (IP or hostname) and a Display Name . 3. Centralized Credential Management

: Assign sessions to specific security groups (e.g., "IT-Admins" vs. "Support").