Cac Reader Not Working

Smart Card reader issues after Feb 11, 2025 update. - Microsoft Q&A

While Windows usually installs generic drivers, some readers (especially older models like the SCR3310) require specific manufacturer drivers to function correctly with military systems. Visit the reader manufacturer’s website to download the latest drivers. cac reader not working

Sometimes "updating" the driver doesn't work. A clean reinstall often fixes communication errors. Smart Card reader issues after Feb 11, 2025 update

Ensure your computer is turned on and you are using a supported browser ( Microsoft Edge, Chrome, or Firefox – not the new Chromium Edge with strict flags, and avoid Safari for military sites). Sometimes "updating" the driver doesn't work

The failure of a Common Access Card (CAC) reader is a common technical hurdle for military personnel and government employees, typically stemming from driver conflicts, service interruptions, or certificate mismanagement. Addressing this issue requires a methodical approach that progresses from physical hardware checks to complex software and registry configurations.

If the hardware is working and drivers are installed, the issue may be how your browser handles the security certificates.

Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Calais\Readers .