Certificate Not Found

Apr 5, 2026 · 3 views

Problem

OneSigner reports "Certificate not found" or the certificate list is empty.

Solutions

1. Check USB Token is Connected

• Ensure the USB token is physically plugged in
• Check Device Manager for the token (Smart card readers)
• Try a different USB port

2. Check Certificate Store

1. Open certmgr.msc (run as the same user running OneSigner)
2. Navigate to Personal → Certificates
3. Verify your certificate is listed with a key icon (indicates private key is available)

3. Check Token Driver

• SafeNet: Open SafeNet Authentication Client → verify token is visible
• YubiKey: Open YubiKey Manager → verify PIV certificates
• ePass2003: Check vendor management tool

4. User Session Required

Important: USB token signing requires an interactive Windows desktop session. The Windows service runs in Session 0 and cannot directly access USB tokens. OneSigner handles this automatically by spawning a signing process in the user's session.

• Ensure a user is logged in to Windows (desktop session active)
• For unattended operation, configure Auto-Logon in the GUI
• Remote Desktop sessions may work if the token is redirected

5. Restart Token Service

net stop SCardSvr
net start SCardSvr