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Outlook s/mime smart card send signed mails error "error in underlying security subsystem. internal error"

Björn Schläfli


CVAD 2203

Outlook 2016


Some of our users use their smart card to sign emails in Outlook. Every now and then they're unable to send the signed mail. The PIN prompt window doesn't load and the error message "error in underlying security subsystem. internal error" is displayed. It only affects Outlook over Citrix. No issue in Outlook locally installed on clients.

If the issue happens kill all open Outlook processes and start Outlook again fix it for a while (same session). 

It affects Outlook seamless and in published hosted desktops.

It also happens on Virtual Desktops (Windows 10 22h2).

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