When initiating the connection, you must tell the RDP client to share local devices.
| Problem | Likely Cause | Fix | |---------|--------------|-----| | Scanner not visible in remote session | Redirection not enabled in RDP client | Re-check “Scanners” under Local Resources | | “No scanner found” even after enabling | Scanner driver missing locally | Ensure scanner works locally first | | Scanner visible but scan fails halfway | RDP timeout or bandwidth limit | Increase RDP bandwidth (disable “Slow link” detection) | | Scanner works but very slow | RDP compression overhead | Use lower resolution (150–200 DPI) or enable UDP transport | | Scanner uses WIA but remote app expects TWAIN | API mismatch | Install TWAIN drivers on client, or use a TWAIN‑compatible app | | Error: “Scanner redirection blocked by policy” | Server GP disallows it | Check fDisableScannerRedirection registry or GPO on server | | Scanner redirection works for admin but not user | User lacks local scanner access | Add user to local “Distributed COM Users” or “Scanner” group (client side) | remote desktop scanner redirection