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What is the role of the Diagnosis button in the Classic Client Toolbox?

Applies to

All Classic Client versions up to Classic Client 6.2 on Microsoft Operating Systems


This button can repair cards with key set or certificate issues.

This sort of problem can arise when a card/token has been used previously with a version of Classic Client that is older than 5.0 (when it was called GemSafe Libraries). To help you, Classic Client provides a Diagnosis function that checks key set and certificate data objects on the card.

To use the Diagnosis function

  1. Open the Classic Client Toolbox
  2. In the Card Contents folder, click Card Properties, select the reader and click Next.
  3. Enter the PIN associated with the smart card/token in the PIN Code area and click Login.
  4. Click the Advance button, to display the Card Repair Options
  5. Click Diagnosis. Classic Client checks the integrity of the data objects that make up a key set on the card. If the structure of the data objects is correct, an "OK" message appears. Otherwise the Card Repair Options, to tell you that the card needs to be "repaired".
  6. Check one or more boxes according to the operations you want to perform, then click OK.

    • Repair key sets : creates the descriptor object for a key set if it appears to be missing.
    • Erase data objects with no association : erases descriptor data objects that do not appear to be linked with a key set.
    • Reset default key container : as the first two options may affect the key set that is considered to be the default, this option enables you to reset it.

More information

A correctly structured key set has a private key, a public key, a certificate and a descriptor object.


Modifications to the operating system can lead to unrecoverable errors. Modifications are reserved to advanced users. If you do not feel confident we recommend creating a System Restore Point before performing changes.

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