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Connection to the card reader is lost

In particular, if card readers are connected via USB device servers, the network in between can cause the timeout of 5 seconds to be exceeded and Windows to deregister the signature card.

By adding / setting the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Cryptography\Calais\TransactionTimeoutDelay can be increased from the default of 5 seconds up to 60 seconds.

S. also. https://support.microsoft.com/en-us/help/2706168/applications-that-use-smart-card-authentication-stop-responding-on-a-c

intarsys x A-Trust: The German provider of signature solutions, intarsys, and Austria's leading trust service provider, A-Trust, have entered into a strategic partnership...